Pierce Pond Dam Reservoir Report
Nearby: Simonds Pond Dam Mirror Lake Dam
Last Updated: December 22, 2025
Pierce Pond Dam in Leominster, Massachusetts, is a private recreational dam constructed in 1911 primarily for recreation purposes.
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Summary
The dam stands at a height of 14 feet with a hydraulic height of 10 feet, creating a storage capacity of 158 acre-feet and a surface area of 28.6 acres. The dam, made of concrete and rockfill, spans a length of 470 feet along the MONOOSNOC BROOK, within the Worcester County.
Despite its fair condition assessment, Pierce Pond Dam has a high hazard potential, indicating the need for regular inspections and maintenance to ensure public safety. The Department of Conservation and Recreation regulates the dam, enforcing state permitting, inspection, and enforcement. With a moderate risk assessment rating of 3, stakeholders and water resource enthusiasts should stay informed about the dam's risk management measures and emergency action plans to mitigate potential hazards and protect the surrounding community and environment.
Year Completed |
1911 |
Dam Length |
470 |
Dam Height |
14 |
River Or Stream |
MONOOSNOC BROOK |
Primary Dam Type |
Concrete |
Surface Area |
28.6 |
Hydraulic Height |
10 |
Drainage Area |
6.55 |
Nid Storage |
158 |
Hazard Potential |
High |
Foundations |
Unlisted/Unknown |
Nid Height |
14 |
Seasonal Comparison
Weather Forecast
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.
Pierce Pond Dam