Notown Reservoir Dike Reservoir Report
Nearby: Upper Sawmill Pond Dam James Pond Dam
Last Updated: December 13, 2025
Notown Reservoir Dike, located in Leominster, Massachusetts, was completed in 1876 and serves as a crucial structure for water supply purposes.
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Summary
The dike, with a height of 25 feet and a length of 750 feet, impounds the waters of the Monoosnoc Brook, providing a maximum storage capacity of 3900 acre-feet. Despite its age, the dam is in fair condition and is inspected every two years by the Department of Conservation and Recreation.
The dam has a high hazard potential and is regulated by the state of Massachusetts. It does not have a spillway and is classified as an earth dam with a buttress core type. The reservoir covers an area of 200 acres and has a drainage area of 4.6 square miles. The dam's risk assessment is deemed high, with risk management measures yet to be specified. Although the dam is not under the jurisdiction of the US Army Corps of Engineers, its critical role in water resource management underscores the importance of ongoing monitoring and maintenance to ensure public safety and environmental sustainability.
Year Completed |
1876 |
Dam Length |
750 |
Dam Height |
25 |
River Or Stream |
MONOOSNOC BROOK |
Primary Dam Type |
Earth |
Surface Area |
200 |
Hydraulic Height |
25 |
Drainage Area |
4.6 |
Nid Storage |
3900 |
Hazard Potential |
High |
Foundations |
Unlisted/Unknown |
Nid Height |
25 |
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.
Notown Reservoir Dike