Delaney Complex E Bolton Dam Reservoir Report
Nearby: Delaney Complex Assabet River Dam
Last Updated: December 18, 2025
The Delaney Complex E Bolton Dam, located in Maynard, Massachusetts, is a crucial structure designed by the USDA NRCS for flood risk reduction along the TR-ELIZABETH BROOK.
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Summary
Completed in 1971, this gravity dam stands at a height of 16 feet and spans 600 feet, with a storage capacity of 3,900 acre-feet. While primarily serving flood risk reduction, the dam also supports fish and wildlife habitat, recreational activities, and pond functionality.
Managed by the Department of Conservation and Recreation in Massachusetts, the Delaney Complex E Bolton Dam is regulated, permitted, and inspected by state authorities to ensure its structural integrity and operational efficiency. With a low hazard potential and a satisfactory condition assessment, the dam poses a moderate risk, prompting the implementation of risk management measures. Although currently uncontrolled, the spillway and outlet gates are integral components of the dam's emergency action plan for potential inundation events.
Overall, the Delaney Complex E Bolton Dam stands as a testament to sustainable water resource management in Worcester, Massachusetts. With its multiple functions and state-regulated operations, the dam exemplifies the importance of balancing flood risk reduction with ecological and recreational benefits for the surrounding community. As climate change continues to impact water resources, structures like the Delaney Complex E Bolton Dam play a vital role in enhancing resilience and safeguarding the local environment for generations to come.
Year Completed |
1971 |
Dam Length |
600 |
Dam Height |
16 |
River Or Stream |
TR-ELIZABETH BROOK |
Primary Dam Type |
Gravity |
Surface Area |
3 |
Hydraulic Height |
4.6 |
Drainage Area |
7.88 |
Nid Storage |
3900 |
Outlet Gates |
Uncontrolled |
Hazard Potential |
Low |
Foundations |
Unlisted/Unknown |
Nid Height |
16 |
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.
Delaney Complex E Bolton Dam
Harvard Road 314, Stow