Notown Reservoir Dam Reservoir Report
Last Updated: December 13, 2025
Notown Reservoir Dam, located in Leominster, Massachusetts, stands as a critical water resource infrastructure designed for water supply purposes.
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Summary
Completed in 1876, this Earth dam stands at 26 feet high and spans 600 feet in length, with a storage capacity of 3,900 acre-feet. The dam overlooks the Monoosnoc Brook and serves as a vital component in the water management system of Worcester County.
Managed by the Department of Conservation and Recreation in Massachusetts, the dam is state-regulated, inspected, and enforced to ensure its structural integrity and compliance with safety standards. Despite being classified as having a high hazard potential, the dam is assessed to be in fair condition as of December 2016. With a moderate risk level, the Notown Reservoir Dam remains a key piece of infrastructure in the region, providing essential water resources while maintaining a level of risk management in place.
Year Completed |
1876 |
Dam Length |
600 |
Dam Height |
26 |
River Or Stream |
MONOOSNOC BROOK |
Primary Dam Type |
Earth |
Surface Area |
200 |
Hydraulic Height |
21 |
Drainage Area |
4.6 |
Nid Storage |
3900 |
Hazard Potential |
High |
Foundations |
Unlisted/Unknown |
Nid Height |
26 |
Seasonal Comparison
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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.
Notown Reservoir Dam