Grist Mill Pond Dam Reservoir Report
Nearby: Hager Pond Dam Carding Mill Pond Dam
Last Updated: December 18, 2025
Grist Mill Pond Dam, located in Sudbury, Massachusetts, was completed in 1800 and serves as a crucial structure for recreational purposes.
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Summary
The earth dam, with a height of 18 feet and a hydraulic height of 14 feet, stands on the Hop Brook river and provides a storage capacity of 150.3 acre-feet. Despite its historical significance, the dam's condition assessment in 2009 revealed poor maintenance, indicating a potential risk to the surrounding area.
Managed by the Department of Conservation and Recreation in Massachusetts, the Grist Mill Pond Dam is regulated and inspected by the state agency to ensure public safety and compliance with environmental regulations. With a low hazard potential but a moderate risk rating, the dam highlights the importance of regular maintenance and risk management measures to prevent any potential disasters. While the dam's condition assessment may raise concerns, it also presents an opportunity for stakeholders to address the issues and improve the structure's resilience for future generations of water resource and climate enthusiasts to enjoy.
Year Completed |
1800 |
Dam Height |
18 |
River Or Stream |
HOP BROOK |
Primary Dam Type |
Earth |
Surface Area |
0.03 |
Hydraulic Height |
14 |
Drainage Area |
2.8 |
Nid Storage |
150.3 |
Hazard Potential |
Low |
Foundations |
Unlisted/Unknown |
Nid Height |
18 |
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.
Grist Mill Pond Dam
Lakeview Avenue 98, Framingham