MA00496 Fitzgerald Pond Dam-Phase I Report-Northampton-2023_04_26.pdf
FITZGERALD POND DAM
PHASE I
INSPECTION / EVALUATION REPORT
Dam Name: Fitzgerald Pond Dam
NID#: MA00496
Owner: City of Northampton
Town: Northampton, Massachusetts
Consultant: Tighe & Bond, Inc.
Date of Inspection: April 26, 2023
Tighe&Bond
Fitzgerald Pond Dam, Northampton Date of Inspection: April 26, 2023
Executive Summary
This Phase I Inspection/Evaluation Report details the inspection and evaluation of
Fitzgerald Pond Dam located in Northampton, Massachusetts. The inspection was
conducted on April 26, 2023 by Tighe & Bond of Westfield, Massachusetts. Fitzgerald
Pond Dam is classified as a Intermediate, Low (Class III) hazard potential dam.
The overall physical condition of Fitzgerald Pond Dam was found to be Satisfactory
based on the Office of Dam Safety’s September 2008 rating guidelines. The primary
reasons for the Satisfactory condition rating are trees present within 20 feet of the right
abutment. The following deficiencies were noted during the inspection and evaluation:
· Isolated areas of erosion are present on the upstream slope.
· Upstream slope protection was observed in isolated areas.
· Vegetation is growing on the upstream end of the auxiliary spillway weir.
· One bare area and minor rutting are present along the embankment crest.
· Rutting is present on the downstream slope. The rutting is perpendicular to the
slope on the downstream face and appears to have resulted from mowing
practices.
· Brush and woody vegetation are growing from the auxiliary spillway channel on
the left side.
· Nuisance vegetation, including thick thorns, are growing from the embankment,
especially surrounding the low-level outlet headwall.
· Trees are present within 20 feet of the right abutment.
Tighe & Bond recommends the following actions be taken to address the deficiencies
found at the dam during this inspection and evaluation. The tasks listed below are
divided into two categories: short range tasks and long range tasks. The short range
tasks are higher priority tasks that the dam owner should include in budget development
for the near future. The long range tasks are lower priority tasks where conditions do
not currently warrant immediate action, but will require attention in the future. The
priority of long range tasks may increase, if conditions worsen.
Short Range Tasks
· Loam and seed rutted and bare areas.
· Repair eroded areas on the upstream slope.
· Clear and grub nuisance vegetation and brush near the auxiliary spillway and the
outlet headwall.
· Remove trees and stumps within 20 feet of the dam.
· Update the Operation and Maintenance Plan.
· Investigate presence of slope protection.
Long Range Tasks
· Perform a limited stability analysis of the steep area surrounding the outlet
structure.
· Install additional slope protection along upstream slope.
Tighe&Bond
Fitzgerald Pond Dam, Northampton Date of Inspection: April 26, 2023
These recommendations should be performed under the direction of a registered
professional engineer familiar with the methods and materials used in the design,
construction, and repair of dams.
The conditions noted in this 2023 dam inspection report are similar to those noted in the
2013 report. Repairs and improvements made since the last report, include adding
riprap around the drop inlet structure and on the left side of the structure approximately
1-foot above the water level.
Low No
10 Years
12. Spillway Capacity (% SDF)
E1. Design Methodology:4 E7. Low-Level Discharge Capacity:4
E2. Level of Maintenance:3 E8. Low-Level Outlet Physical Condition:5
E3. Emergency Action Plan:2 E9. Spillway Design Flood Capacity:5
E4. Embankment Seepage:5 E10. Overall Physical Condition of the Dam:4
E5. Embankment Condition:4 E11. Estimated Repair Cost:$510,000
E6. Concrete Condition:5
E1: DESIGN METHODOLOGY E7: LOW-LEVEL OUTLET DISCHARGE CAPACITY
1. Unknown Design – no design records available 1. No low level outlet, no provisions (e.g. pumps, siphons) for emptying pond
2. No design or post-design analyses 2. No operable outlet, plans for emptying pond, but no equipment
3. No analyses, but dam features appear suitable 3. Outlet with insufficient drawdown capacity, pumping equipment available
4. Design or post design analysis show dam meets most criteria 4. Operable gate with sufficient drawdown capacity
5. State of the art design – design records available & dam meets all criteria 5. Operable gate with capacity greater than necessary
E2: LEVEL OF MAINTENANCE E8: LOW-LEVEL OUTLET PHYSICAL CONDITION
1. Dam in disrepair, no evidence of maintenance, no O&M manual 1. Outlet inoperative needs replacement, non-existent or inaccessible
2. Dam in poor level of upkeep, very little maintenance, no O&M manual 2. Outlet inoperative needs repair
3. Dam in fair level of upkeep, some maintenance and standard procedures 3. Outlet operable but needs repair
4. Adequate level of maintenance and standard procedures 4. Outlet operable but needs maintenance
5. Dam well maintained, detailed maintenance plan that is executed 5. Outlet and operator operable and well maintained
E3: EMERGENCY ACTION PLAN E9: SPILLWAY DESIGN FLOOD CAPACITY
1. No plan or idea of what to do in the event of an emergency 1. 0 - 50% of the SDF or unknown
2. Some idea but no written plan 2. 50-90% of the SDF
3. No formal plan but well thought out 3. 90 - 100% of the SDF
4. Available written plan that needs updating 4. >100% of the SDF with actions required by caretaker (e.g. open outlet)
5. Detailed, updated written plan available and filed with MADCR, annual training 5. >100% of the SDF with no actions required by caretaker
E4: SEEPAGE (Embankments, Foundations, & Abutments)E10: OVERALL PHYSICAL CONDITION OF DAM
1. Severe piping and/or seepage with no monitoring 1. UNSAFE – Major structural, operational, and maintenance deficiencies
2. Evidence of monitored piping and seepage exist under normal operating conditions
3. No piping but uncontrolled seepage 2. POOR - Significant structural, operation and maintenance deficiencies
4. Controlled seepageMinor seepage or high volumes of seepage with filtered collection are clearly recognized under normal loading conditions
5. No seepage or minor seepage with filtered collection 3. FAIR - Significant operational and maintenance deficiencies, no structural
E5: EMBANKMENT CONDITION (See Note 1) deficiencies. Potential deficiencies exist under unusual loading conditions
1. Severe erosion and/or large trees that may realistically occur. Can be used when uncertainties exist as to
2. Significant erosion or significant woody vegetation critical parameters
3. Brush and exposed embankment soils, or moderate erosion 4. SATISFACTORY - Minor operational and maintenance deficiencies.
4. Unmaintained grass, rodent activity and maintainable erosion Infrequent hydrologic events would probably result In deficiencies.
5. Well maintained healthy uniform grass cover 5. GOOD - No existing or potential deficiencies recognized. Safe performance
E6: CONCRETE CONDITION (See Note 2) is expected under all loading including SDF
1. Major cracks, misalignment, discontinuities causing leaks, E11: ESTIMATED REPAIR COST
seepage or stability concerns Estimation of the total cost to address all identified structural, operational,
2. Cracks with misalignment inclusive of transverse cracks with no maintenance deficiencies. Cost shall be developed utilizing standard
misalignment but with potential for significant structural degradation estimating guides and procedures
3. Significant longitudinal cracking and minor transverse cracking
4. Spalling and minor surface cracking
5. No apparent deficiencies
Evaluation Description
Changes/Deviations to Database Information since Last Inspection
10. Insp. Frequency:
>100% SDF w/ no actions by Caretaker
Dam Evaluation Summary Detail Sheet
October 25, 2013
1. NID ID:
9. Hazard Code:
3. Dam Location:
9a. Is Hazard Code Change Requested?:
6. Next Inspection:
MA00496
Fitzgerald Lake Dam
4. Inspection Date: April 26, 2023
7. Inspector:
8. Consultant:
2. Dam Name:
SATISFACTORY
David Azinheira, P.E.
Tighe & Bond, Inc.
5. Last Insp. Date:
April 26, 2033Northampton, MA
11. Overall Physical Condition of Dam:
Table of Contents Tighe&Bond
Fitzgerald Pond Dam, Northampton i Date of Inspection: April 26, 2023
Executive Summary
Dam Evaluation Summary Detail Sheet
Preface
Section 1 Description of Project
1.1 General .........................................................................................1-1
1.1.1 Authority ............................................................................. 1-1
1.1.2 Purpose of Work................................................................... 1-1
1.1.3 Definitions ........................................................................... 1-1
1.1.4 Figures ............................................................................... 1-1
1.2 Description of Project......................................................................1-1
1.2.1 Location .............................................................................. 1-1
1.2.2 Owner/Caretaker.................................................................. 1-2
1.2.3 Purpose of the Dam .............................................................. 1-2
1.2.4 Description of the Dam and Appurtenances ............................. 1-2
1.2.5 Operations and Maintenance .................................................. 1-3
1.2.6 DCR Size Classification .......................................................... 1-3
1.2.7 DCR Hazard Potential Classification ........................................ 1-3
1.3 Engineering Data ...........................................................................1-3
1.3.1 Drainage Area ...................................................................... 1-3
1.3.2 Reservoir ............................................................................ 1-3
1.3.3 Discharges at the Dam Site ................................................... 1-3
1.3.4 General Elevations ............................................................... 1-4
1.3.5 Primary Spillway .................................................................. 1-4
1.3.6 Auxiliary Spillway ................................................................. 1-4
1.3.7 Low Level Outlet .................................................................. 1-4
1.3.8 Design and Construction Records ........................................... 1-5
1.3.9 Operating Records ................................................................ 1-5
1.4 Summary Data Table ......................................................................1-5
Section 2 Inspection
2.1 Visual Inspection ............................................................................2-1
2.1.1 General Findings .................................................................. 2-1
2.1.2 Dam ................................................................................... 2-1
2.1.3 Appurtenant Structures ......................................................... 2-2
2.1.4 Downstream Area................................................................. 2-3
2.1.5 Impoundment Area .............................................................. 2-3
2.2 Caretaker Interview ........................................................................2-3
2.3 Operation and Maintenance Procedures .............................................2-3
2.3.1 Operational Procedures ......................................................... 2-3
2.3.2 Maintenance of Dam and Operating Facilities ........................... 2-3
Table of Contents Tighe&Bond
Fitzgerald Pond Dam, Northampton ii Date of Inspection: April 26, 2023
2.4 Emergency Warning System ............................................................2-3
2.5 Hydrologic/Hydraulic Data ...............................................................2-3
2.6 Awareness of Potential Dam Related Safety Hazards at, near, and on
Dams ............................................................................................2-4
2.7 Structural Stability/Overtopping Potential ..........................................2-5
2.7.1 Structural Stability ............................................................... 2-5
2.7.2 Overtopping Potential ........................................................... 2-5
Section 3 Assessments and Recommendations
3.1 Assessments..................................................................................3-1
3.2 Studies and Analyses ......................................................................3-2
3.3 Recurrent Maintenance Recommendations .........................................3-3
3.4 Recommended Minor Repairs ...........................................................3-3
3.5 Recommended Remedial Modifications ..............................................3-3
3.6 Alternatives ...................................................................................3-3
3.7 Opinion of Probable Costs ................................................................3-4
Tables
1.1 Summary Data Table
Figures
Figure 1: Site Locus & Downstream Area Map
Figure 2: Orthophotograph
Figure 3: Drainage Area Map
Appendices
A Photo Location Plan and Photographs
B Inspection Checklist
C Previous Reports and References
D Definitions
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I\Reports\Fitzgerald Pond Dam - Phase 1 Report - 05-09-2023\Fitzgerald Pond Dam - Report Text.docx
Section 1 Description of Project Tighe&Bond
Fitzgerald Pond Dam, Northampton 1-1 Date of Inspection: April 26, 2023
Section 1
Description of Project
1.1 General
1.1.1 Authority
The City of Northampton retained Tighe & Bond to perform a visual inspection and prepare
a report of the observed conditions at Fitzgerald Pond Dam in Northampton,
Massachusetts. This inspection and report were performed in general accordance with
MGL Chapter 253, Sections 44-50 of the Massachusetts General Laws as amended by
Chapter 330 of the Acts of 2002.
1.1.2 Purpose of Work
The purpose of this investigation is to inspect and evaluate the present condition of the
dam and appurtenant structures in general accordance with 302 CMR 10.07 to provide
information that will assist in both prioritizing dam repair needs and planning/conducting
maintenance and operation.
The investigation is divided into four parts: 1) obtain and review available reports,
investigations, and data previously submitted to the owner pertaining to the dam and
appurtenant structures; 2) perform a visual inspection of the site; 3) evaluate the status
of an emergency action plan for the site and; 4) prepare and submit a final report
presenting the evaluation of the structure, including recommendations and remedial
actions, and opinion of probable costs.
1.1.3 Definitions
To provide the reader with a better understanding of the report, definitions of commonly
used terms associated with dams are provided in Appendix D. Many of these terms may
be included in this report. The terms are presented under common categories associated
with dams which include: 1) orientation; 2) dam components; 3) size classification; 4)
hazard potential classification; and 5) miscellaneous. Reference to left and right directions
assume an orientation facing downstream.
1.1.4 Figures
Figures were created for this report to aid the reader in understanding the dam, its
features, and the surrounding area. Figure 1 presents a topographic image showing the
site locus and downstream area. Figure 2 presents an aerial overview of the dam and
surrounding area. Figure 3 presents a topographic image showing the watershed area
associated with the dam.
1.2 Description of Project
1.2.1 Location
Fitzgerald Pond Dam is located on Broad Brook in Northampton, MA in Hampshire County.
The structure and impoundment are shown on the Easthampton USGS quadrangle map at
coordinates 42.35634°, - 72.65943°. The dam is located within the Fitzgerald Lake
Conservation Area in the Florence section of Northampton. Access to the dam and spillway
Section 1 Description of Project Tighe&Bond
Fitzgerald Pond Dam, Northampton 1-2 Date of Inspection: April 26, 2023
is from Cooke Ave, north of Hatfield Street. An unpaved road leads from a trail kiosk,
through a gate that is typically open, partway to the dam, where a second gate is located
that is typically locked. A key is available in the City of Northampton planning office. The
roads are passable by 4-wheel drive vehicle. See Figures 1 and 2 in the Figures section of
this report for the USGS site locus map and the aerial photograph, respectively.
1.2.2 Owner/Caretaker
The dam is owned and operated by the City of Northampton. See Table 1.1 for current
owner/caretaker data (names and contact information).
1.2.3 Purpose of the Dam
Fitzgerald Lake Dam impounds Fitzgerald Lake for recreational and conservation
purposes. The dam was originally constructed by the USDA Soil Conservation Service,
now the Natural Resource Conservation Service (NRCS) although, unlike most NRCS
dams, it is not known to have been designed as a flood control dam.
1.2.4 Description of the Dam and Appurtenances
Fitzgerald Lake Dam is an earth embankment dam of approximately 550 feet in length
with a drop inlet structure and an earthen auxiliary spillway. The dam has a structure
height of approximately 21.5 feet, and has a hydraulic height of approximately 16.5 feet
as measured from the primary spillway elevation. The width of the dam’s crest is
approximately 14 feet and the upstream and downstream slopes are approximately 3
horizontal units to one vertical unit (3H:1V). The upstream and downstream slopes are
vegetated with grass, other than immediately surrounding the drop inlet structure,
where the upstream slope is steeper and armored with riprap. The dam’s crest was
designed with a gravel road, although it is now mostly vegetated with grass.
The primary spillway consists of a drop inlet structure that was originally constructed of
asphalt coated corrugated concrete pipe (ACCMP), although the structure was encased
in concrete lined with stainless steel in 1998. The inner diameter of the riser structure is
66 inches, and the circular top end, which is horizontal, serves as a weir to maintain the
dam’s normal pool elevation. A galvanized steel debris shield surrounds the weir and a
trash rack is located on top of the structure. Chain link fencing surrounding the
structure deters beaver activity.
Flow from the drop inlet structure passes through the dam in an ACCMP conduit that was
also lined with a 42-inch stainless steel liner and the interstice grouted in 1998. Design
drawings show anti-seep diaphragms (assumed to be anti-seep collars) are installed
along the outlet pipe. Two toe drains are also present. A concrete headwall that was
installed in 1998 supports the outlet conduit and the discharge points of the toe drains.
The dam contains a low-level outlet that consists of a 24-inch ACCMP with an 18-inch
stainless steel liner that discharges into the bottom of the drop inlet structure. The
outlet is operated with an 18-inch gate valve and is fitted with a trash rack on the
upstream end.
An earthen emergency spillway is located at the dam’s left abutment. It is
approximately 60 feet in length, grass lined, and discharges to the downstream area.
Section 1 Description of Project Tighe&Bond
Fitzgerald Pond Dam, Northampton 1-3 Date of Inspection: April 26, 2023
An earth berm serves as the right spillway training wall, and natural ground serves as
the training wall on the right.
1.2.5 Operations and Maintenance
An operation and maintenance plan for the dam is available, and the plan is generally
followed. The dam is mowed once a year in the fall and brush is cut once a year in the
winter. Other maintenance items are performed on an as-needed basis.
1.2.6 DCR Size Classification
Fitzgerald Pond Dam has a maximum structural height of approximately 21.5 feet and a
maximum storage capacity of approximately 420 acre-feet. Therefore, in accordance with
Department of Conservation and Recreation classification procedures, under
Commonwealth of Massachusetts 302 CMR 10.00 Dam Safety, revised February 10, 2017,
Fitzgerald Pond Dam is a Intermediate size structure based on height and storage. Refer
to Appendix D for definitions of dam height and storage.
1.2.7 DCR Hazard Potential Classification
Fitzgerald Pond Dam is located upstream of wooded conservation areas. Several
residences are located between 1.2 and 1.7 miles downstream but appear to be located
between 10 and 20 feet above the stream channel. A failure of the dam at maximum pool
may cause minimal property damage to others. Loss of life is not expected.
Therefore, in accordance with Department of Conservation and Recreation classification
procedures, under the Commonwealth of Massachusetts Regulations 302 CMR 10.00 Dam
Safety, as revised February 10, 2017, Fitzgerald Pond Dam is currently classified as a Low
(Class III) hazard potential dam.
1.3 Engineering Data
The following sections are based on available information from previously submitted
reports listed in Appendix C, and are intended to provide an overview of the dam and
impoundment.
1.3.1 Drainage Area
The total drainage area contributing to the dam is approximately 1.4 square miles, based
on a watershed delineated using USGS StreamStats. The drainage area is comprised
mainly of forested areas, although portions of the watershed include densely-developed
areas in downtown Florence and the eastern portion of the Northampton Veterans
Administration Hospital. Figure 3, included in the Figures section of this report, outlines
the drainage area boundary for Fitzgerald Pond Dam.
1.3.2 Reservoir
See Table 1.1 for data on normal and maximum pools.
1.3.3 Discharges at the Dam Site
No recorded discharges from the dam were available at the time of the inspection.
Section 1 Description of Project Tighe&Bond
Fitzgerald Pond Dam, Northampton 1-4 Date of Inspection: April 26, 2023
1.3.4 General Elevations
Elevations presented are in units of feet and based on the North American Vertical Datum
of 1988 (NAVD88).
A. Top of Dam 211.2
B. Spillway Design Flood Pool 209.1 +/-
C. Normal Pool 206.2
D. Upstream Water at Time of the Inspection 205.9+/-
E. Streambed at Toe of the Dam 189.7
F. Low Point along Toe of the Dam 189.7
1.3.5 Primary Spillway
Elevations presented are in units of feet, and based on the NAVD88 datum.
A. Type Concrete and stainless steel drop inlet
B. Length of Weir 17.3 feet/66-in diameter
C. Crest Elevation of Weir 206.2
D. Upstream Channel Fitzgerald Lake
E. Downstream Channel Broad Brook
F. Downstream Water Elevation 192.2 +/-
1.3.6 Auxiliary Spillway
Elevations presented are in units of feet, and based on the NAVD88 datum.
A. Type Earthen channel
B. Length of weir 60 feet
C. Crest Elevation of Weir 208.7
D. Upstream Channel Fitzgerald Lake
E. Downstream Channel Broad Brook
F. Downstream Water Elevation 191.45 +/-
1.3.7 Low Level Outlet
Elevations presented are in units of feet, and based on the NAVD88 datum.
A. Type Stainless steel-lined corrugated metal pipe
B. Size 18-inch diameter
C. Closure Type Gate valve
D. Inlet Invert Elevation 191.7
E. Outlet Invert Elevation 191.7
Section 1 Description of Project Tighe&Bond
Fitzgerald Pond Dam, Northampton 1-5 Date of Inspection: April 26, 2023
1.3.8 Design and Construction Records
Record drawings for the 1998 dam rehabilitation are available from Tighe & Bond and
were reviewed as part of the inspection process. Original design drawings were not
available for review but may be on file at the NRCS offices in Amherst, Massachusetts.
1.3.9 Operating Records
No known operating records are available for Fitzgerald Lake Dam.
1.4 Summary Data Table
Table 1.1, summarizing the required Phase I Report data collected during the preparation
of this report is presented on the following page.
Required Phase I Report Data Data Provided by the Inspecting Engineer
National ID #MA00496
Dam Name Fitzgerald Lake Dam
Dam Name (Alternate) N/A
River Name Broad Brook
Impoundment Name Fitzgerald Lake
Hazard Class Low
Size Class Intermediate
Dam Type Earthen Embankment
Dam Purpose Recreational
Structural Height of Dam (feet) 21.5
Hydraulic Height of Dam (feet) 16.5
Drainage Area (sq. mi.) 1.4
Reservoir Surface Area (acres) 49
Normal Impoundment Volume (acre-feet) 294
Max Impoundment Volume ((top of dam) acre-feet) 420
SDF Impoundment Volume* (acre-feet) 402 (100-year storm)
Spillway Type Drop inlet structure
Spillway Length (feet) 66-in diameter
Freeboard at Normal Pool (feet) 5
Principal Spillway Capacity* (cfs) 300
Auxiliary Spillway Capacity* (cfs) 790
Low-Level Outlet Capacity* (cfs) unknown
Spillway Design Flood* (flow rate - cfs) 50-year storm
Winter Drawdown (feet below normal pool) N/A
Drawdown Impoundment Vol. (acre-feet) N/A
Latitude 42.35634
Longitude -72.659437
City/Town Northampton
County Name Hampshire
Public Road on Crest No
Public Bridge over Spillway No
EAP Date (if applicable) N/A
Owner Name City of Northampton Planning Dept.
Owner Address 210 Main Street
Owner Town Northampton, MA 01060
Owner Phone 413-587-1287
Owner Emergency Phone N/A
Owner Type Municipality or Political subdivision
Caretaker Name Same as owner
Caretaker Address N/A
Caretaker Town N/A
Caretaker Phone N/A
Caretaker Emergency Phone N/A
Date of Field Inspection 4/26/2023
Consultant Firm Name Tighe & Bond, Inc.
Inspecting Engineer David Azinheira, P.E.
Engineer Phone Number 413-875-1634
*In the event a hydraulic and hydrologic analysis has not been completed for the dam, indicate "No H&H" in this table, recommendation
section shall include specific recommendation to hire a qualified dam engineering consultant to conduct analysis to determine spillway
adequacy in conformance with 302 CMR 10.00.
1.1 Summary Data Table
Fitzgerald Pond Dam, Northampton Date of Inspection: April 26, 2023
Section 2 Inspection Tighe&Bond
Fitzgerald Pond Dam, Northampton 2-1 Date of Inspection: April 26, 2023
Section 2
Inspection
2.1 Visual Inspection
Fitzgerald Pond Dam was visually inspected on April 26, 2023. At the time of the
inspection, the weather was clear with temperatures in the 60’s °F. Underwater areas
were not inspected. Photographs to document the current conditions of the dam were
taken during the inspection and are included in Appendix A. A copy of the inspection
checklist is included in Appendix B.
2.1.1 General Findings
In general, Fitzgerald Pond Dam was found to be in Satisfactory condition as defined by
DCR’s current rating guidelines. The primary reasons for the Satisfactory condition rating
are the trees present within 20 feet of the right abutment. Observations are identified in
more detail in the sections below.
2.1.2 Dam
· Abutments (Photos 10 and 18)
o Embankment-abutment contact appeared stable on both sides.
o Trees are present on natural ground within 20 feet of the right abutment.
o Minor brush was observed on left abutment.
· Upstream Slope (Photos 1, 3, 4, 19, 20, 21, and 22)
o The upstream slope is generally well vegetated with grass.
o The upstream slope is benched, with the bench located below the normal pool
water line.
o The slope appears to be steeper than 2H:1V surrounding the drop inlet
structure. Riprap was observed around the drop inlet structure that was added
between the October 2013 inspection and on this April 2023 inspection.
o Slope protection was observed on the upstream face on the right side of the
drop inlet structure with riprap approximately 1-foot above the water line.
o An eroded path is present on the upstream slope near the right abutment.
· Embankment Crest (Photos 5, 6, and 7)
o The embankment crest alignment is generally good, with no significant
transverse low areas or signs of horizontal misalignment.
o The crest is generally well vegetated, with the exception of tire ruts that run
the length of the embankment. In some areas, the ruts are depressed.
o A bare area is present near the right abutment.
· Downstream Slope (Photos 2, 7, 8, 11, 17, and 27)
o The downstream slope is generally well vegetated, with the exception of:
Section 2 Inspection Tighe&Bond
Fitzgerald Pond Dam, Northampton 2-2 Date of Inspection: April 26, 2023
Ruts resulting from recent mowing are present on the downstream
slope, running from crest to toe, along the length of the slope.
Nuisance vegetation, including thick thorn bushes, were observed,
especially surrounding the low-level outlet headwall.
o The downstream slope and toe area are generally dry, with no uncontrolled
seepage observed.
· Drains (Photos 13 and 14)
o The left and right toe drain pipes had iron staining but were dry at the time of
the inspection. The right toe drain had moss growing below it, indicating some
flow is likely occurring regularly.
· Instrumentation
o There was no instrumentation observed at this dam.
· Access Roads and Gates (Photos 18)
o The dam is located within a conservation area and is more than a half mile from
the nearest public roads. The unpaved roads that lead to the dam are gated.
No gates are present at the dam.
2.1.3 Appurtenant Structures
· Primary Spillway (Photos 15, 20, 23, 24, and 25)
o The galvanized debris shield protecting the primary spillway appears to be in
serviceable condition with minor rusting through the galvanized coating at the
water line.
o The fencing surrounding the outlet structure was replaced in 2013 and
appeared to be in good condition.
· Auxiliary Spillway (Photos 4, 9, and 10)
o The groundcover vegetation in the auxiliary spillway appeared to be generally
well maintained. However, brush and woody vegetation is establishing within
the channel on the left side and could marginally reduce its capacity. Emergent
herbaceous vegetation at the upstream end of the spillway also requires
cutting.
· Outlets (Photos 11, 12, 13, and 14)
o The projecting end of the outlet pipe appeared to be stable. The interior of the
pipe is stained, but the staining is likely to be deposited material since the liner
is stainless steel.
o The concrete headwall, which was constructed in 1998, appeared to be in good
condition, although dormant thorny vegetation was observed surrounding the
headwall.
· Dikes
o There are no dikes associated with this dam.
Section 2 Inspection Tighe&Bond
Fitzgerald Pond Dam, Northampton 2-3 Date of Inspection: April 26, 2023
2.1.4 Downstream Area
(Photo 11 and 26)
o The downstream channel is generally flat but appeared to be free-flowing.
o The downstream area is sparsely developed. Wetlands, forest, and
conservation land are present within a mile downstream of the dam.
2.1.5 Impoundment Area
(Photo 16)
o The impoundment is irregularly shaped with the dam located on the east side.
o The surrounding area is gently sloping and is wooded. There is no development
along the shoreline.
o A narrow fringe of marsh is present along the majority of the impoundment
shoreline.
2.2 Caretaker Interview
Tom Annese, from the City of Northampton Planning and Sustainability Department, Land
and Planning Projects Assistant, was available during the inspection to answer questions
related to the history, operation, and maintenance of the dam. Information provided by
Tom Annese has been incorporated into this report.
2.3 Operation and Maintenance Procedures
2.3.1 Operational Procedures
An operation and maintenance program plan is available for the dam. Although the dam
is mowed at a lower frequency than recommended in the plan, the dam is mowed once a
year in the fall and brush is cut once a year in the winter.
2.3.2 Maintenance of Dam and Operating Facilities
Standard maintenance measures include mowing the embankment once a year, removing
debris from around the drop inlet structure on a monthly basis, reestablishing vegetation
in thin or bare areas, preventing development of a tailwater condition in the stilling basin,
and performing minor repairs and removing debris as needed.
2.4 Emergency Warning System
An Emergency Action Plan (EAP) is not available for Fitzgerald Lake Dam. An EAP is not
required by the Massachusetts Dam Safety regulations at this time for low-hazard dams
in accordance with the current state dam safety regulations. The Operation and
Maintenance Plan has limited information on what to do if an unusual or emergency
condition is identified.
2.5 Hydrologic/Hydraulic Data
Fitzgerald Lake Dam is an Intermediate size, Low hazard structure. In accordance with
current state dam safety regulations, the spillway design flood (SDF) is the 50-year storm.
A Hydraulic & Hydrologic (H&H) Analysis was performed as part of the Chapter 253 (Dam
Section 2 Inspection Tighe&Bond
Fitzgerald Pond Dam, Northampton 2-4 Date of Inspection: April 26, 2023
Safety) permit application in support of the 1998 repairs, prepared by Tighe & Bond, dated
April 1996.
The following values were estimated in the analysis:
A. Spillway Design Flood (SDF) Return Period 50-year
B. SDF used in the H&H analysis 100-year
C. SDF Outflow (CFS) 250.3
D. Total Spillway Capacity (CFS) 790 (water level at top of dam)
367 (with 1 foot of freeboard)
The estimated capacity of the primary spillway is approximately 146% of the
100-year storm. More freeboard would be available during a 50-year storm.
The analysis was performed with a combination of hand calculations and
computations in TR-20. Development levels within watershed do not appear to
have changed significantly since the analysis was performed.
2.6 Awareness of Potential Dam Related Safety Hazards
at, near, and on Dams
During the Fitzgerald Pond Dam inspection safety hazards that may exist at, near, and on
the dam were identified.
Observations related to dam related safety hazards at Fitzgerald Pond Dam are identified
below:
· On the dam
o No safety hazards were observed at the time of the inspection.
· Near dam on land
o No safety hazards were observed at the time of the inspection.
· Areas immediately upstream and downstream of dam
o No safety hazards were observed at the time of the inspection.
· Downstream of dam along the stream channel
o The low-level outlet capacity is not anticipated to cause a significant increase
in downstream flow rates if there is a deliberate release of water
Implementation of any recommendations may require local, state, or federal permits as
well as securing property rights if subject areas are not owned by the dam owner.
Securing such permits and/or land rights is the sole responsibility of the dam owner.
The dam owner is reminded that the Dam Safety Regulations 302 CMR Section 10.13:
Liability (1), states: The owner shall be responsible and liable for damage to property of
others or injury to persons, including but not limited to, loss of life resulting from the
operation, failure of or mis-operation of a dam.
Section 2 Inspection Tighe&Bond
Fitzgerald Pond Dam, Northampton 2-5 Date of Inspection: April 26, 2023
2.7 Structural Stability/Overtopping Potential
2.7.1 Structural Stability
There are no records of a stability analysis of the structure available for review during the
inspection and preparation of this report. Visual observations made at the time of the
inspection indicate that the structure appears to be stable. A more comprehensive
analysis would need to be performed to confirm this observation.
2.7.2 Overtopping Potential
Based on the H&H information presented in Section 2.4, the spillways have sufficient
capacity to safely pass the SDF. It is estimated that there will be approximately 2.1 feet
of freeboard during the 100-year storm, and greater freeboard is expected during the
50-year SDF.
Section 3 Assessments and Recommendations Tighe&Bond
Fitzgerald Pond Dam, Northampton 3-1 Date of Inspection: April 26, 2023
Section 3
Assessments and Recommendations
3.1 Assessments
Based on the visual inspection and a review of available information, Fitzgerald Pond Dam
is generally considered in Satisfactory condition as defined by current DCR rating
guidelines. The primary reasons for the Satisfactory condition rating are the trees present
with 20 feet of the right abutment. The dam was found to have the following deficiencies:
1. Isolated areas of erosion are present on the upstream slope.
2. Upstream slope protection was observed in isolated areas.
3. Vegetation is growing on the upstream end of the auxiliary spillway weir.
4. One bare area and minor rutting are present along the embankment crest.
5. Rutting is present on the downstream slope. The rutting is perpendicular to the
slope on the downstream face and appears to have resulted from mowing practices.
6. Brush and woody vegetation are growing from the auxiliary spillway channel on the
left side.
7. Nuisance vegetation, including thick thorns, are growing from the embankment,
especially surrounding the low-level outlet headwall.
8. Trees are present within 20 feet of the right abutment.
Conditions during the April 2023 inspection were similar to the conditions reported in the
October 2013 Phase I Inspection Report for Fitzgerald Pond Dam, the most recent
inspection report obtained for review. Repairs and improvements made since the last
report, include adding riprap around the drop inlet structure and on the left side of the
structure approximately 1-foot above the water level. Presented below is a comparison of
previously reported conditions to current conditions at the dam:
Section 3 Assessments and Recommendations Tighe&Bond
Fitzgerald Pond Dam, Northampton 3-2 Date of Inspection: April 26, 2023
Previously Identified Deficiency Resolution or Current Condition
Isolated areas of erosion are present on the
upstream slope.
Condition remains.
Upstream slope protection was not observed,
although it has been previously reported.
Condition remains.
Tall, emergent vegetation is growing from the
upstream embankment bench and from the
upstream end of the auxiliary spillway weir.
Condition remains.
One bare area and minor rutting are present
along the embankment crest.
Condition remains.
The steep area surrounding the drop inlet
structure may be steeper than designed or
constructed, although it appeared to be stable
at the time of the inspection.
Riprap was observed around the drop inlet
structure that was added between the October
2013 inspection and on this April 2023
inspection.
Rutting is present on the downstream slope.
The rutting is perpendicular to the slope on the
downstream face and appears to have resulted
from mowing practices.
Condition remains.
Brush and woody vegetation is growing from
the auxiliary spillway channel on the left side.
Condition remains.
Nuisance vegetation, including thick thorns,
are growing from the embankment, especially
surrounding the low-level outlet headwall.
Condition remains.
The discharge invert of the outlet conduit
through the dam was submerged by
approximately 6 inches at the time of the
inspection. Following the inspection, the
owner reported that the condition was
addressed
Condition remains.
Trees are present within 20 feet of the right
abutment. Since the most recent inspection,
the Office of Dam Safety has instituted a policy
requiring removal of trees on and within 20 feet
of dam embankments and appurtenances.
Condition remains.
The following recommendations and remedial modifications generally describe the
recommended approach to address current deficiencies at the dam. Prior to undertaking
recommended maintenance, repairs, and remedial measures, the applicability of
environmental permits needs to be determined to assess those activities that may occur
within resource areas under the jurisdiction of local conservation commissions, MassDEP,
or other regulatory agencies.
3.2 Studies and Analyses
Although not necessary, the City may consider updating the existing Operation and
Maintenance Plan to follow current best practices for dam operation and maintenance, and
to reflect current regulatory requirements.
The presence or absence of slope protection on the upstream slope should be investigated.
Section 3 Assessments and Recommendations Tighe&Bond
Fitzgerald Pond Dam, Northampton 3-3 Date of Inspection: April 26, 2023
3.3 Recurrent Maintenance Recommendations
The following recommended activities should be performed on a regular, or yearly, basis
and recorded:
1. Mow the embankment using a cross-slope mowing pattern instead of mowing
perpendicular to the slope, and stagger mowing tracks. Increase the frequency of
mowing to better control establishment of nuisance vegetation.
2. Exercise the gate valve on an annual basis.
3. Remove debris from the drop inlet structure debris screen and auxiliary spillway
approach.
4. Loam and seed bare areas or areas of poor vegetative cover.
5. Continue deterring beaver from establishing in the area and maintain beaver
deterrents.
6. Cut vegetation within the emergency spillway channel and sides.
7. Restore free discharge of outlet (reportedly complete).
8. Update the Emergency Action Plan annually.
3.4 Recommended Minor Repairs
The following repairs and maintenance items are recommended to improve the overall
condition of the dam:
1. Remove trees and brush on the embankment, abutments, and within 20 feet of the
dam in accordance with the Massachusetts Office of Dam Safety’s Policy on Trees
on Dams. It is recommended that stumps and roots be removed in their entirety,
as roots can shrink as they decay, which could cause preferential seepage paths.
Backfill all voids with appropriate material, which would vary based on the location
on the dam.
2. Loam and seed rutted, bare, and eroded areas on the crest, downstream slope,
and upstream slope above the waterline.
3. Clear and grub nuisance vegetation, including thorn bushes and brush, from the
embankment and emergency spillway channel, and backfill with compacted
granular fill, loam and seed.
3.5 Recommended Remedial Modifications
The following recommended modifications to the dam would alter the current configuration
or design of the dam:
1. If inadequate slope protection is present on the upstream slope, the slope should
be armored with riprap from below the waterline to the dam’s crest.
3.6 Alternatives
No repair alternatives have been developed at this time.
Section 3 Assessments and Recommendations Tighe&Bond
Fitzgerald Pond Dam, Northampton 3-4 Date of Inspection: April 26, 2023
3.7 Opinion of Probable Costs
The following opinion of probable costs has been developed for the studies, analyses,
recommendations and remedial measures noted above. The probable construction costs
are an approximation based on limited investigations and our experience on other similar
sized projects, and are not based on detailed quantity takeoffs or designs. Once further
detailed investigations are performed, the scope of work may change, affecting the actual
construction costs. The estimates include engineering, permits and contingencies where
applicable. Tasks that likely could be carried out by the dam owner/caretaker are noted
as Force Account. The yearly recommendations provided above can likely be carried out
by the dam owner/caretaker, and are not included in the table below.
The tasks listed below are divided into two categories: short range tasks and long range
tasks. The short range tasks are higher priority tasks that the dam owner should include
in budget development for the near future. The long range tasks are lower priority tasks
where conditions do not currently warrant immediate action, but will require attention in
the future. The priority of the long range tasks may increase if conditions worsen. It is
important to understand that it is the dam owner’s responsibility to evaluate the costs and
risks of each task and to determine the appropriate priority as the dam owner is ultimately
liable for any damages resulting from the operation or failure of the dam.
Recommendation Probable Cost(1)
Short Range Tasks
1 Loam and seed rutted and bare areas. $7,000
2 Repair eroded areas on the upstream slope $14,000
3 Clear and grub nuisance vegetation and brush near the
auxiliary spillway and the outlet headwall. $21,000
4 Remove trees and stumps within 20 feet of the dam $42,000
5 Update the Operation and Maintenance Plan $7,000(2)
6 Investigate presence of slope protection $3,000
Long Range Tasks
1 Perform a limited stability analysis of the steep area
surrounding the outlet structure. $14,000(2)
2 Install additional slope protection along upstream slope. $420,000
Total
Total repair cost minus Studies and Analyses
$528,000
$507,000
SAY $510,000
(1) Unless otherwise noted, the probable costs shown assume that short range tasks are performed
together as a single project and long range tasks are performed as a separate project rather than
individually. Performing tasks individually may result in greater overall cost in engineering,
permitting, contractor mobilization, and other factors.
(2) Studies and analysis
\\Tighebond.com\data\Data\Projects\N\N0936 Northampton DPW\056 Fitzgerald Pond Dam Phase
I\Reports\Fitzgerald Pond Dam - Phase 1 Report - 05-09-2023\Fitzgerald Pond Dam - Report Text.docx
Tighe&Bond
Fitzgerald Pond Dam, Northampton Date of Inspection: April 26, 2023
Figures
Based on USGS Topographic Map forEasthampton, MA [Site Quad] Revised 1979and Williamsburg, MA Revised 1990.Contour Interval Equals 10-feet and 3-meters respectively.
0 1,000 2,000
Feet
1:24,000
V:\Projects\N\N0936\Fitzgerald Lake Dam\MXD\MA00496_FitzgeraldLakeDam_Topo.mxd [Exported By: DValadas, 5/18/2023, 10:03:24 AM]
FIGURE 1SITE LOCUS AND DOWNSTREAMAREA MAP
Fitzgerald Lake DamNorthampton, MassachusettsMA00496
May 2023
N-0936
Latitude: 42.35634
Longitude: -72.659437
DAM LOCATION
Tighe&Bond
FIGURE 2ORTHOPHOTOGRAPH
Fitzgerald Lake DamNorthampton, MassachusettsMA00496
0 150 300
Feet
1:3,600
V:\Projects\N\N0936\Fitzgerald Lake Dam\MXD\MA00496_FitzgeraldLakeDam_Aerial.mxd [Exported By: DValadas, 5/18/2023, 9:47:41 AM]
Based on MassGIS Color Orthophotography (2021)
N-0936
May 2023
Latitude: 42.35634
Longitude: -72.659437
DAM LOCATION
Tighe&Bond
Based on USGS Topographic Map forEasthampton, MA [Site Quad] Revised 1979and Williamsburg, MA Revised 1990.Contour Interval Equals 10-feet and 3-meters respectively.Drainage Area Calculated in USGS StreamStats V4.14.0: MA
0 750 1,500
Feet
1:18,000
V:\Projects\N\N0936\Fitzgerald Lake Dam\MXD\MA00496_FitzgeraldLakeDam_Drainage.mxd [Exported By: DValadas, 5/18/2023, 10:24:32 AM]
FIGURE 3DRAINAGE AREA MAP
Fitzgerald Lake DamNorthampton, MassachusettsMA00496
May 2023
N-0936
Latitude: 42.35634
Longitude: -72.659437
Drainage Area: 1.35 Sq Mi
DAM LOCATION
Tighe&Bond
Legend
Drainage Area
Tighe&Bond
Fitzgerald Pond Dam, Northampton Date of Inspection: April 26, 2023
APPENDIX A
Photo Location Plan & Photographs
Tighe&Bond
Fitzgerald Pond Dam, Northampton Date of Inspection: April 26, 2023
Photo 1 – Overview of dam from upstream
Photo 2 – Overview of dam from downstream
Tighe&Bond
Fitzgerald Pond Dam, Northampton Date of Inspection: April 26, 2023
Photo 1 – Overview of upstream embankment from right abutment
Photo 4 – Overview of upstream slope from auxiliary spillway
Tighe&Bond
Fitzgerald Pond Dam, Northampton Date of Inspection: April 26, 2023
Photo 5 – Overview of dam crest from right abutment
Photo 6 – Overview of dam crest from auxiliary spillway
Tighe&Bond
Fitzgerald Pond Dam, Northampton Date of Inspection: April 26, 2023
Photo 7 – Overview of dam crest from right abutment
Photo 8 – Overview of dam embankment downstream slope from auxiliary
spillway
Tighe&Bond
Fitzgerald Pond Dam, Northampton Date of Inspection: April 26, 2023
Photo 9 – Overview of downstream, side of auxiliary spillway; note standing
water
Photo 10 – Overview of upstream side of auxiliary spillway; note some
standing water was observed, and minor brush was observed on the left side
Tighe&Bond
Fitzgerald Pond Dam, Northampton Date of Inspection: April 26, 2023
Photo 11 – Overview of stilling basin located downstream of primary spillway
Photo 12 – Overview of the primary spillway outlet and headwall; notes the
water level is below the pipe outlets, and some minor vegetation observed
adjacent to the headwall
Tighe&Bond
Fitzgerald Pond Dam, Northampton Date of Inspection: April 26, 2023
Photo 13 – Toe drain to the left of the spillway outlet
Photo 14 – Toe drain to the right of spillway outlet; note iron staining, and
moss growing adjacent to the toe drain
Tighe&Bond
Fitzgerald Pond Dam, Northampton Date of Inspection: April 26, 2023
Photo 15 – Overview of primary spillway drop inlet structure; note fence
Photo 16 – Overview of the impoundment
Tighe&Bond
Fitzgerald Pond Dam, Northampton Date of Inspection: April 26, 2023
Photo 17 – Erosion at path on downstream embankment
Photo 18 – Right abutment contact; note trees located within 20 feet of dam
and bare area on crest, and access road
Tighe&Bond
Fitzgerald Pond Dam, Northampton Date of Inspection: April 26, 2023
Photo 19 – Eroded path on upstream Embankment; note absence of slope
protection on upstream slope
Photo 20 – Previously observed steep section of embankment surrounding
the drop inlet structure has been filled with riprap; note a minor depression
was observed on the left side
Tighe&Bond
Fitzgerald Pond Dam, Northampton Date of Inspection: April 26, 2023
Photo 21 – Minor depression and irregular, sloped areas observed along
upstream slope
Photo 22 – Minor vegetation observed growing on upstream embankment
Tighe&Bond
Fitzgerald Pond Dam, Northampton Date of Inspection: April 26, 2023
Photo 23 – Close-up of primary spillway; note rust
Photo 24 – Closeup of primary spillway drop inlet structure from above
Tighe&Bond
Fitzgerald Pond Dam, Northampton Date of Inspection: April 26, 2023
Photo 25 – Beaver prevention pipe
Photo 26 – Channel downstream of dam
Tighe&Bond
Fitzgerald Pond Dam, Northampton Date of Inspection: April 26, 2023
Photo 27 – Minor rutting observed on downstream embankment toe; typical
along dam
Tighe&Bond
Fitzgerald Pond Dam, Northampton Date of Inspection: April 26, 2023
APPENDIX B
Inspection Checklist
NAME OF DAM:STATE ID #:REGISTERED:CHANGE IN HAZARD CLASSIFICATION REQUESTED?: NoCITY/TOWN:COUNTY:DAM LOCATION:ALTERNATE DAM NAME:(street address if known)USGS QUAD.:LAT.: LONG.:DRAINAGE BASIN:RIVER:TYPE OF DAM:OVERALL LENGTH (FT):YEAR BUILT: STRUCTURAL HEIGHT (FT):EL. NORMAL POOL (FT):HYDRAULIC HEIGHT (FT):EL. MAXIMUM POOL (FT):FOR INTERNAL MADCR USE ONLYFOLLOW-UP INSPECTION REQUIRED:CONDITIONAL LETTER:207.0PURPOSE OF DAM: Recreational21.51964/1965MAXIMUM POOL STORAGE (ACRE-FT): 420202.016.5NORMAL POOL STORAGE (ACRE-FT): 294IMPOUNDMENT NAME(S): Fitzgerald LakeGENERAL DAM INFORMATIONEarthen Embankment550LowNorthamptonHampshireFitzgerald Lake Conservation AreaSTATE SIZE CLASSIFICATION: IntermediateDAM LOCATION INFORMATIONSTATE HAZARD CLASSIFICATION:Easthampton, MA42.35634 -72.659437ConnecticutBroad BrookDAM SAFETY INSPECTION CHECKLISTFitzgerald Lake Dam2-8-214-17MA00496NID ID #:YESNOYESNOYESNODam Safety Inspection Checklist v.3.1Page 1
NAME OF DAM:STATE ID #:INSPECTION DATE:NID ID #:DATE OF INSPECTION:DATE OF PREVIOUS INSPECTION:ARMY CORPS PHASE I: If YES, dateCONSULTANT:PREVIOUS DCR PHASE I: If YES, date 22-Oct-03OVERALL PHYSICALCONDITION OF DAM:DATE OF LAST REHABILITATION:SPILLWAY CAPACITY:EL. POOL DURING INSP.:EL. TAILWATER DURING INSP.: Click on box to select E-codeClick on box to select E-codeE1)5E2)5E3)4E4)$510,000E5)NOE6)NOE7) LOW-LEVEL OUTLET CAPACITYNAME OF INSPECTING ENGINEER:SIGNATURE:TEMPERATURE/WEATHER: Sunny, 68 deg. FTighe & Bond, Inc.Fitzgerald Lake Dam2-8-214-17INSPECTION SUMMARYMA00496April 26, 2023October 25, 2013BENCHMARK/DATUM: AssumedSATISFACTORY1996188PERSONS PRESENT AT INSPECTION>100% SDF w/ no actions by Caretaker201.7+/-NAMETITLE/POSITIONREPRESENTINGDavid Azinheira, PE, CFMSenior Engineer Tighe & Bond, Inc.Megan SidurStaff Engineer Tighe & Bond, Inc.EVALUATION INFORMATION TYPE OF DESIGN 4E8) LOW-LEVEL OUTLET CONDITION ESTIMATED REPAIR COST LEVEL OF MAINTENANCE 3E9) SPILLWAY DESIGN FLOOD CAPACITY EMERGENCY ACTION PLAN 2E10) OVERALL PHYSICAL CONDITIONDavid Azinheira, P.E.April 26, 20234 BRIDGE NEAR DAM EMBANKMENT CONDITION 4 ROADWAY OVER CREST CONCRETE CONDITION 5 EMBANKMENT SEEPAGE 5E11)YESNOYESNODam Safety Inspection Checklist v.3.1Page 2
NAME OF DAM:STATE ID #:INSPECTION DATE:NID ID #:OWNER: City of Northampton Planning Dept. CARETAKER:Carolyn Misch AICP/DirectorEMERGENCY PH. #EMERGENCY PH. #FAXEMAILOWNER TYPESPILLWAY LENGTH (FT)SPILLWAY CAPACITY (CFS)AUXILIARY SPILLWAY TYPEAUX. SPILLWAY CAPACITY (CFS)NUMBER OF OUTLETSOUTLET(S) CAPACITY (CFS)TYPE OF OUTLETSTOTAL DISCHARGE CAPACITY (CFS)DRAINAGE AREA (SQ MI)SPILLWAY DESIGN FLOOD (PERIOD/CFS)HAS DAM BEEN BREACHED OR OVERTOPPED IF YES, PROVIDE DATE(S)FISH LADDER (LIST TYPE IF PRESENT)DOES CREST SUPPORT PUBLIC ROAD? IF YES, ROAD NAME:PUBLIC BRIDGE WITHIN 50' OF DAM? IF YES, ROAD/BRIDGE NAME:MHD BRIDGE NO. (IF APPLICABLE)Fitzgerald Lake Dam2-8-214-17ORGANIZATIONORGANIZATION Same as OwnerMA00496April 26, 2023NAME/TITLENAME/TITLE Tom Annese, Land Planning AssistantSTREET 210 Main StreetSTREET 210 Main StreetTOWN, STATE, ZIP Northampton, MA 01060 TOWN, STATE, ZIP Northampton, MA 01060PHONE 413-587-1287PHONE 641-260-1796SS-lined ACCMP w/ 18-in gate valve1.4unknown1,095 +/-50-year stormFAXcmisch@northamptonma.govEMAILtannese@northamptonma.govPRIMARY SPILLWAY TYPE Drop inlet structureMunicipality or Political subdivision30079066-in diameterGrass lined earthenN/A1YESNOYESNOYESNODam Safety Inspection Checklist v.3.1Page 3
NAME OF DAM:STATE ID #:INSPECTION DATE:NID ID #:AREAINSPECTEDXXXCRESTXXXXXXADDITIONAL COMMENTS:NOACTIONMONITORREPAIRMinor ruttingWell-maintained grass except on ruts; one bare area near right abutmentStable abutment contactNone observedNone observedGenerally evenGenerally straightGravelFitzgerald Lake DamApril 26, 20232-8-214-17MA00496CONDITIONOBSERVATIONSEMBANKMENT (CREST)Trees located near right abutment.7. GRASS COVER CONDITION9. ABUTMENT CONTACT1. SURFACE TYPE2. SURFACE CRACKING3. SINKHOLES, ANIMAL BURROWS4. VERTICAL ALIGNMENT (DEPRESSIONS)5. HORIZONTAL ALIGNMENT6. RUTS AND/OR PUDDLES8. WOODY VEGETATION (TREES/BRUSH)Dam Safety Inspection Checklist v.3.1Page 4
NAME OF DAM:STATE ID #:INSPECTION DATE:NID ID #:AREAINSPECTEDXXXD/SXSLOPEXXXXXADDITIONAL COMMENTS:NOACTIONMONITORREPAIRRuts from mowing perpendicular to slope. A cross-slope mowing pattern is preferred.None observedGenerally grass, minor rutting on downstream slopeCONDITIONOBSERVATIONSNone observedAppears stableNone observedEMBANKMENT (D/S SLOPE)Fitzgerald Lake DamApril 26, 20232-8-214-17MA004961. WET AREAS (NO FLOW)2. SEEPAGE3. SLIDE, SLOUGH, SCARP4. EMB.-ABUTMENT CONTACT5. SINKHOLE/ANIMAL BURROWS6. EROSIONShrubs and thorns near outlet headwall.7. UNUSUAL MOVEMENT8. GRASS COVER CONDITION9. WOODY VEGETATION (TREES/BRUSH)None observedNone observedDam Safety Inspection Checklist v.3.1Page 5
NAME OF DAM:STATE ID #:INSPECTION DATE:NID ID #:AREAINSPECTEDXXXU/SXSLOPEXXXXADDITIONAL COMMENTS:None observedIsolated areas of riprapNone observedAppears stableAn eroded path is present on the upstream slope, near the right abutment.None observedHealthy grassTall emergent vegetation growing from just below water surface.1. SLIDE, SLOUGH, SCARP2. SLOPE PROTECTION TYPE AND COND.3. SINKHOLE/ANIMAL BURROWS4. EMB.-ABUTMENT CONTACT5. EROSIONEMBANKMENT (U/S SLOPE)Fitzgerald Lake DamApril 26, 20232-8-214-17MA00496CONDITIONOBSERVATIONSNOACTIONMONITORREPAIR6. UNUSUAL MOVEMENT7. GRASS COVER CONDITION8. WOODY VEGETATION (TREES/BRUSH)Dam Safety Inspection Checklist v.3.1Page 6
NAME OF DAM:STATE ID #:INSPECTION DATE:NID ID #:AREAINSPECTEDXXXINSTR.XXXXXXADDITIONAL COMMENTS:None observedN/ANone observedSee 'Downstream Area' for discussion of toe drainsN/A5. INCLINOMETERSCONDITIONOBSERVATIONSNone observedNone observedNone observedNone observedNOACTION4. WEIRS6. SURVEY MONUMENTS7. DRAINS8. FREQUENCY OF READINGS9. LOCATION OF READINGSFitzgerald Lake DamApril 26, 20232-8-214-17MA004963. STAFF GAGE AND RECORDERINSTRUMENTATIONMONITORREPAIR1. PIEZOMETERS2. OBSERVATION WELLSDam Safety Inspection Checklist v.3.1Page 7
NAME OF DAM:STATE ID #:INSPECTION DATE:NID ID #:AREAINSPECTEDXXXD/SXAREAXXXXADDITIONAL COMMENTS:No flow observed at left or right toe drain outlet at the time of the inspection.NOACTIONFlow in ditch parallel to and approximately 100 feet downstream of dam toe on right side.*6. INSTRUMENTATIONMA00496Good access to left side from downstream end of emergency spillway channelFitzgerald Lake DamApril 26, 20232-8-214-17CONDITIONOBSERVATIONSNone observedNone observedDOWNSTREAM AREAMONITORREPAIRMowed grass and herbaceous vegetation.None observedNone observed1. ABUTMENT LEAKAGE2. FOUNDATION SEEPAGE3. SLIDE, SLOUGH, SCARP4. WEIRS5. DRAINAGE SYSTEM7. VEGETATION WITHIN 15 FT 8. ACCESSIBILITY9. DOWNSTREAM HAZARD DESCRIPTION*Not a significant dam safety concern at present. No seepage or flow observed near dam toe.Low - wetland area immediately downstream. Several residences present between 1.2 and 1.7 miles downstream appear to be 10 to 20 feet above channel. Dam Safety Inspection Checklist v.3.1Page 8
NAME OF DAM:STATE ID #:INSPECTION DATE:NID ID #:AREAINSPECTEDMISC.6. WATER PUBLIC HAZARDS & PROTECTIONWHAT: DATE: DATE: DATE:DATE:DATE:PURPOSE:ADDITIONAL COMMENTS:WoodedGentleWoods road from Cooke Ave is used for maintenance access and is passible by vehicles.Vehicle exclusion gates*accessed during inspection)5. SECURITY DEVICES7. VANDALISM OR TRESPASS10. AVAILABILITY OF EAP/LAST UPDATEInterior of drop inlet structure (not *13. CONFINED SPACE ENTRY REQUIREDOctober 25, 201312. CARETAKER/OWNER AVAILABLE11. AVAILABILITY OF O&M MANUALReportedly exists, date unknown7. LAND-SIDE PUBLIC HAZARDS & PROTECTIONMay 1996 record drawingsApril 1996 H&H8. AVAILABILITY OF PLANSFitzgerald Lake DamApril 26, 20232-8-214-17MA004969. AVAILABILITY OF DESIGN CALCSMISCELLANEOUSCONDITIONOBSERVATIONS10 feet1. RESERVOIR DEPTH (AVG)4. ACCESS ROADS2. RESERVOIR SHORELINE3. RESERVOIR SLOPESYESNOYESNOYESNOYESNOYESNOYESNOYESNODam Safety Inspection Checklist v.3.1Page 9
NAME OF DAM:STATE ID #:INSPECTION DATE:NID ID #:AREAINSPECTEDXXXSPILLWAYXXXXXXADDITIONAL COMMENTS:Exterior appears good - free of debris, generally level, and slighly rusting.*N/ANot accessible, although exercised annuallyDrop inlet structureFitzgerald Lake Dam2-8-214-17April 26, 2023MA00496CONDITIONOBSERVATIONS PRIMARY SPILLWAYSPILLWAY TYPENOACTIONMONITORREPAIRHorizontal oriface at rim of drip inletUNUSUAL MOVEMENTAPPROACH AREADISCHARGE AREADEBRISNone observed.ClearAppears clearWEIR TYPESPILLWAY CONDITIONTRAINING WALLSSPILLWAY CONTROLS AND CONDITION*spillway interior not accessible. Fencing used for beaver deterent replaced in 2013.None observed.Dam Safety Inspection Checklist v.3.1Page 10
NAME OF DAM:STATE ID #:INSPECTION DATE:NID ID #:AREAINSPECTEDXXXSPILLWAYXXXXXADDITIONAL COMMENTS:APPROACH AREAWEIR TYPESPILLWAY CONDITIONTRAINING WALLSSPILLWAY CONTROLS AND CONDITIONUNUSUAL MOVEMENT None observed.ClearClearEarthen auxiliary channelN/ABroad crestedFair - Woody vegetation is growing along left side of channel.Right - earthen, well maintained. Left - natural ground.Fitzgerald Lake Dam2-8-214-17April 26, 2023MA00496SPILLWAY TYPEAUXILIARY SPILLWAYNOACTIONMONITORREPAIROBSERVATIONSCONDITIONDISCHARGE AREADEBRISNone observedDam Safety Inspection Checklist v.3.1Page 11
NAME OF DAM:STATE ID #:INSPECTION DATE:NID ID #:AREAINSPECTEDXXXOUTLETXWORKSXXXXXXXXADDITIONAL COMMENTS:24-inch trashrack on inlet end; submergedNOACTIONMONITORREPAIR18-inch SS liner in 24-inch ACCMP with grouted annular space; submergedNone observedDischarge invert of conduit submerged by approximately 6-inches.None observedSEEPAGE/LEAKAGE18-inch gate valve in drop inlet structure; not accessibleNoneGenerally clear42-inch SS liner in ACCMP. Visible areas appear in satisfactory conditionConcrete headwall in good conditionNone observedFitzgerald Lake DamApril 26, 20232-8-214-17MA00496TYPEINTAKE STRUCTURECONDITIONOBSERVATIONSStainless steel lined asphalt-coated corrugated metal pipes with gate valve controlTRASHRACKPRIMARY CLOSUREOUTLET WORKSMISCELLANEOUSDEBRIS/BLOCKAGEUNUSUAL MOVEMENTDOWNSTREAM AREASECONDARY CLOSURECONDUITOUTLET STRUCTURE/HEADWALLEROSION ALONG TOE OF DAMDam Safety Inspection Checklist v.3.1Page 12
NAME OF DAM:STATE ID #:INSPECTION DATE:NID ID #:AREAINSPECTEDCRESTADDITIONAL COMMENTS:NOACTIONMONITORREPAIRFitzgerald Lake DamApril 26, 20232-8-214-17MA00496TYPESURFACE CONDITIONSCONDITIONOBSERVATIONSCONDITIONS OF JOINTSUNUSUAL MOVEMENTCONCRETE/MASONRY DAMS (CREST) HORIZONTAL ALIGNMENTVERTICAL ALIGNMENTDam Safety Inspection Checklist v.3.1Page 13
NAME OF DAM:STATE ID #:INSPECTION DATE:NID ID #:AREAINSPECTEDD/SFACEADDITIONAL COMMENTS:CONCRETE/MASONRY DAMS (DOWNSTREAM FACE) TYPESURFACE CONDITIONSCONDITIONS OF JOINTSUNUSUAL MOVEMENTFitzgerald Lake DamApril 26, 20232-8-214-17MA00496CONDITIONOBSERVATIONSLEAKAGENOACTIONMONITORREPAIRABUTMENT CONTACTDam Safety Inspection Checklist v.3.1Page 14
NAME OF DAM:STATE ID #:INSPECTION DATE:NID ID #:AREAINSPECTEDU/SFACEADDITIONAL COMMENTS:NOACTIONMONITORREPAIRFitzgerald Lake DamApril 26, 20232-8-214-17MA00496TYPESURFACE CONDITIONSCONDITIONOBSERVATIONSCONDITIONS OF JOINTSUNUSUAL MOVEMENTCONCRETE/MASONRY DAMS (UPSTREAM FACE) ABUTMENT CONTACTSDam Safety Inspection Checklist v.3.1Page 15
Tighe&Bond
Fitzgerald Pond Dam, Northampton Date of Inspection: April 26, 2023
APPENDIX C
Previous Reports and References
Tighe&Bond
Fitzgerald Pond Dam, Northampton Date of Inspection: April 26, 2023
PREVIOUS REPORTS AND REFERENCES
The following is a list of reports and drawings that were located during the preparation of
this report, or were referenced in previous reports:
1. Inspection/Evaluation Report prepared by Tighe & Bond, inspection date October
25, 2013.
2. Inspection/Evaluation Report prepared by Tighe & Bond, inspection date October
22, 2003.
3. Certification of Completion and As-Built Drawings, prepared by Tighe & Bond,
dated February 2, 1999.
4. M.G.L Chapter 253 Dam Safety Permit, issued by the Office of Dam Safety, dated
April 3, 1998.
5. Recommended Operation and Maintenance Program, prepared by Tighe & Bond,
undated (believed to be from 1996).
Tighe&Bond
Fitzgerald Pond Dam, Northampton Date of Inspection: April 26, 2023
APPENDIX D
Definitions
Tighe&Bond
Fitzgerald Pond Dam, Northampton Date of Inspection: April 26, 2023
COMMON DAM SAFETY DEFINITIONS
To provide a better understanding of this report, definitions of commonly used terms
associated with dams are provided below. The terms are presented under the following
common categories:
1) Orientation
2) Dam components
3) Size classification
4) Hazard classification
5) General
Orientation
Upstream – Shall mean the side of the dam that borders the impoundment.
Downstream – Shall mean the high side of the dam, the side opposite the upstream side.
Right – Shall mean the area to the right when looking in the downstream direction.
Left – Shall mean the area to the left when looking in the downstream direction.
Dam Components
Dam – Shall mean any artificial barrier, including appurtenant works, which impounds or
diverts water.
Embankment – Shall mean the fill material, usually earth or rock, placed with sloping
sides, such that it forms a barrier that impounds water.
Crest – Shall mean the top of the dam, usually provides a road or path across the dam.
Abutment – Shall mean that part of the valley side against which a dam is constructed.
An artificial abutment is sometimes constructed as a concrete gravity section, to take the
thrust of an arch dam where there is no suitable natural abutment.
Appurtenant Works – Shall mean any ancillary feature of a dam and shall include but not
be limited to, such structures as training walls, spillways, either in the dam or separate
there from and low level outlet works; also water conduits such as tunnels, channels,
pipelines, or penstocks, either through the dam or its abutments.
Riprap – Shall mean a loose assemblage of broken stones erected in water or soft ground
as erosion protection.
Toe – Shall mean the protruding base of the dam on the downstream side either natural
or man-made.
Weir – Shall mean the top of the spillway where the water flows to the downstream side.
Size Classification
(as listed in Commonwealth of Massachusetts, 302 CMR 10.00 Dam Safety Regulations,
revised February 10, 2017)
Tighe&Bond
Fitzgerald Pond Dam, Northampton Date of Inspection: April 26, 2023
Large – Structure with a height greater than 40 feet and/or a storage capacity greater
than 1,000 acre-feet.
Intermediate – Structure with a height between 15 and 40 feet and/or a storage capacity
of 50 to 1,000 acre-feet.
Small – Structure with a height between 6 and 15 feet and/or a storage capacity of 15 to
50 acre-feet.
Non-Jurisdictional – Structure less than 6 feet in height and having a storage capacity of
less than 15 acre-feet.
Hazard Classification
(as listed in Commonwealth of Massachusetts, 302 CMR 10.00 Dam Safety Regulations,
revised February 10, 2017)
High Hazard (Class I) – Shall mean dams located where failure or misoperation will likely
cause loss of life and/or serious damage to homes, industrial or commercial facilities,
important public utilities, or major transportation arteries.
Significant Hazard (Class II) – Shall mean dams located where failure or misoperation
may cause loss of life and/or damage to homes, industrial or commercial facilities,
secondary highways or railroads, or cause the interruption of the use or service of
important facilities.
Low Hazard (Class III) – Dams located where failure or misoperation may cause minimal
property damage to others and loss of life is not expected.
General
DCR – Department of Conservation and Recreation, formerly the Department of
Environmental Management (DEM).
EAP – Emergency Action Plan; shall mean a predetermined plan of action to be taken to
reduce the potential for property damage and/or loss of life in an area affected by an
impending dam break.
O&M Manual – Operations and Maintenance Manual; document identifying routine
maintenance and operational procedures under normal and storm conditions.
Normal Pool – Shall mean the elevation of the impoundment during normal operating
conditions.
Acre-foot – Shall mean a volume equal to one foot of water over a one-acre area.
Height of Dam – Shall mean the vertical distance from the lowest portion of the natural
ground, including any stream channel, along the downstream toe of the dam to the crest
of the dam.
Storage of Dam – Volume contained between the water surface elevation and
impoundment bottom, typically including water and sediment.
Spillway Design Flood (SDF) – Shall mean the flood used in the design of a dam and its
appurtenant works particularly for sizing the spillway and outlet works.