George H. Nichols Multipurpose Dam Reservoir Report
Nearby: Smith Pond Dam Lower Sandra Pond Dam
Last Updated: December 15, 2025
The George H.
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Summary
Nichols Multipurpose Dam, also known as the A-1 Site or Assabet River Dam, is a significant structure located in Northborough, Massachusetts. Built in 1969 by the USDA NRCS, this earth dam stands at a height of 22.3 feet and serves multiple purposes, including flood risk reduction, fish and wildlife habitat creation, and recreational activities. Situated on the Assabet River, this state-regulated dam is managed by the Department of Conservation and Recreation and plays a crucial role in protecting the surrounding area from potential flooding events.
With a storage capacity of 6500 acre-feet and a drainage area of 6.9 square miles, the George H. Nichols Multipurpose Dam provides essential flood control measures for Worcester County, Massachusetts. The dam's uncontrolled spillway and outlet gates help regulate water levels and mitigate potential hazards, earning it a hazard potential rating of 'High' with a satisfactory condition assessment. Regular inspections and maintenance ensure the dam's structural integrity and emergency preparedness, with the last assessment conducted in March 2017.
Despite its age, the George H. Nichols Multipurpose Dam continues to be a key asset for water resource management in the region, with a moderate risk level assigned. As a vital part of the state's flood risk reduction strategy, this dam showcases how multipurpose infrastructure can support environmental conservation, recreation, and public safety. With a rich history and ongoing commitment to excellence, the George H. Nichols Dam exemplifies the intersection of water resource management and climate resilience efforts in Massachusetts.
Year Completed |
1969 |
Dam Length |
1550 |
Dam Height |
22.3 |
River Or Stream |
ASSABET RIVER |
Primary Dam Type |
Earth |
Surface Area |
380 |
Hydraulic Height |
14 |
Drainage Area |
6.9 |
Nid Storage |
6500 |
Outlet Gates |
Uncontrolled |
Hazard Potential |
High |
Foundations |
Unlisted/Unknown |
Nid Height |
22 |
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.
George H. Nichols Multipurpose Dam
Chauncy Street 19, Westborough