Brass Mill Pond Dam Reservoir Report
Last Updated: December 6, 2025
Brass Mill Pond Dam in Williamsburg, Massachusetts, is a privately owned masonry dam with a primary purpose listed as "Other." This structure is regulated by the Department of Conservation and Recreation in Massachusetts, with state jurisdiction and enforcement in place.
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Summary
The dam has a height of 20 feet and a hydraulic height of 15 feet, with a storage capacity of 74 acre-feet and a drainage area of 29.3 square miles.
Despite its low hazard potential, Brass Mill Pond Dam has been assessed as being in poor condition, with the last inspection conducted in July 2010. The dam's risk assessment is moderate, with a rating of 3 on a scale of 1 to 5. The structure is categorized as having uncontrolled spillway type and a surface area of zero. With a history of modifications undocumented, the dam presents some level of risk that requires management measures to be put in place. As a point of interest for water resource and climate enthusiasts, Brass Mill Pond Dam serves as a reminder of the importance of maintaining and monitoring infrastructure to ensure safety and sustainability in the face of changing environmental conditions.
Dam Height |
20 |
Primary Dam Type |
Masonry |
Hydraulic Height |
15 |
Drainage Area |
29.3 |
Nid Storage |
74 |
Hazard Potential |
Low |
Foundations |
Unlisted/Unknown |
Nid Height |
20 |
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.
Brass Mill Pond Dam
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