Tyler Dam Reservoir Report
Last Updated: December 14, 2025
Tyler Dam, also known as Assabet River Dam, is a state-owned structure located in Hudson, Massachusetts.
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Summary
Built in 1980 by the USDA NRCS, the primary purpose of this earth dam is flood risk reduction. Standing at 34 feet high with a hydraulic height of 24 feet, Tyler Dam has a storage capacity of 5,500 acre-feet and serves multiple purposes including fish and wildlife pond maintenance and recreation for the local community.
Managed by the Department of Conservation and Recreation, Tyler Dam plays a crucial role in regulating the flow of the Assabet River in Middlesex County. Despite being classified as a high hazard potential structure, the dam is currently in satisfactory condition and undergoes regular inspections every two years. With a moderate risk assessment score of 3, the dam has emergency action plans in place, although they may need updating to meet current guidelines.
For water resource and climate enthusiasts, Tyler Dam presents an interesting case study in dam management and flood risk reduction. Its location in Marlborough, Massachusetts, along the Assabet River provides essential flood control measures while also supporting local wildlife and recreational activities. With its unique design and important role in the area, Tyler Dam stands as a testament to effective water resource management and the importance of maintaining infrastructure for the benefit of both people and the environment.
Year Completed |
1980 |
Dam Length |
1490 |
Dam Height |
34 |
River Or Stream |
ASSABET RIVER |
Primary Dam Type |
Earth |
Surface Area |
2 |
Hydraulic Height |
24 |
Drainage Area |
39.5 |
Nid Storage |
5500 |
Outlet Gates |
Uncontrolled |
Hazard Potential |
High |
Foundations |
Unlisted/Unknown |
Nid Height |
34 |
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.
Tyler Dam
Bartlett Street 152, Northborough