Neponset River Dam - Hyde Park Reservoir Report
Last Updated: December 19, 2025
The Neponset River Dam in Hyde Park, Massachusetts, plays a crucial role in flood risk reduction along the Neponset River.
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Summary
Owned by the state and regulated by the Department of Conservation and Recreation, this concrete gravity dam stands at a height of 22 feet and has a hydraulic height of 11.7 feet. With a storage capacity of 200 acre-feet and a drainage area of 98 square miles, the dam serves as a vital structure in protecting surrounding areas from potential flooding.
Despite its important function, the Neponset River Dam is currently assessed as being in poor condition, with a significant hazard potential. The last inspection in March 2018 revealed the need for improvements to ensure the dam's reliability and safety. With a very high risk assessment rating, it is crucial that maintenance and management measures are implemented promptly to address any deficiencies and mitigate potential risks associated with the dam.
Water resource and climate enthusiasts will find the Neponset River Dam an intriguing subject for study and advocacy. With its location in Milton, Massachusetts, and its role in flood risk reduction along the Neponset River, this dam presents an opportunity for further research on the intersection of infrastructure, water management, and climate resilience. The current condition assessment and risk factors associated with the dam also highlight the importance of ongoing monitoring and maintenance to ensure the safety and effectiveness of this critical structure in the region.
Dam Length |
160 |
Dam Height |
22 |
River Or Stream |
NEPONSET RIVER |
Primary Dam Type |
Concrete |
Surface Area |
0.2 |
Hydraulic Height |
11.7 |
Drainage Area |
98 |
Nid Storage |
200 |
Hazard Potential |
Significant |
Foundations |
Unlisted/Unknown |
Nid Height |
22 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Dam Data Reference
Condition Assessment
SatisfactoryNo existing or potential dam safety deficiencies are recognized. Acceptable performance is expected under all loading conditions (static, hydrologic, seismic) in accordance with the minimum applicable state or federal regulatory criteria or tolerable risk guidelines.
Fair
No existing dam safety deficiencies are recognized for normal operating conditions. Rare or extreme hydrologic and/or seismic events may result in a dam safety deficiency. Risk may be in the range to take further action. Note: Rare or extreme event is defined by the regulatory agency based on their minimum
Poor A dam safety deficiency is recognized for normal operating conditions which may realistically occur. Remedial action is necessary. POOR may also be used when uncertainties exist as to critical analysis parameters which identify a potential dam safety deficiency. Investigations and studies are necessary.
Unsatisfactory
A dam safety deficiency is recognized that requires immediate or emergency remedial action for problem resolution.
Not Rated
The dam has not been inspected, is not under state or federal jurisdiction, or has been inspected but, for whatever reason, has not been rated.
Not Available
Dams for which the condition assessment is restricted to approved government users.
Hazard Potential Classification
HighDams assigned the high hazard potential classification are those where failure or mis-operation will probably cause loss of human life.
Significant
Dams assigned the significant hazard potential classification are those dams where failure or mis-operation results in no probable loss of human life but can cause economic loss, environment damage, disruption of lifeline facilities, or impact other concerns. Significant hazard potential classification dams are often located in predominantly rural or agricultural areas but could be in areas with population and significant infrastructure.
Low
Dams assigned the low hazard potential classification are those where failure or mis-operation results in no probable loss of human life and low economic and/or environmental losses. Losses are principally limited to the owner's property.
Undetermined
Dams for which a downstream hazard potential has not been designated or is not provided.
Not Available
Dams for which the downstream hazard potential is restricted to approved government users.
Area Campgrounds
| Location | Reservations | Toilets |
|---|---|---|
YMCA Camp
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Spang Camp Site
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Ponkapoag Camp of Appalachian Mountain Club
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Missionary Point
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Camp Christina Entrance
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Neponset River Dam - Hyde Park
Providence Highway 267, Dedham