Lake Noquochoke Upper Dam Reservoir Report

Last Updated: December 20, 2025

Lake Noquochoke Upper Dam, located in Dartmouth, Massachusetts, is a gravity dam on the Westport River primarily used for flood risk reduction.


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Summary

Built in 1942, this structure stands at a height of 8 feet and has a storage capacity of 630 acre-feet, with a normal storage level of 450 acre-feet. The dam's drainage area is 20 square miles, and it serves as an essential component for water supply in the region.

Despite its importance, Lake Noquochoke Upper Dam has been assessed as being in poor condition as of the last inspection in 2011. The hazard potential is rated as low, but the risk assessment indicates a moderate level of risk. The dam is regulated by the Department of Conservation and Recreation in Massachusetts, and it undergoes regular state inspections and enforcement measures to ensure its integrity and safety. While it may have some deficiencies, the dam continues to play a crucial role in protecting the surrounding area from flooding and maintaining water resources for the community.

Overall, Lake Noquochoke Upper Dam is a vital infrastructure for flood control and water supply management in Bristol County. Its historical significance and ongoing functionality contribute to the resilience of the region in the face of changing climate conditions. As water resource and climate enthusiasts, understanding the importance of maintaining and improving structures like this dam is essential for ensuring the sustainability and safety of our water systems in the future.

Year Completed

1942

Dam Length

370

Dam Height

8

River Or Stream

WESTPORT RIVER

Primary Dam Type

Gravity

Hydraulic Height

8

Drainage Area

20

Nid Storage

630

Hazard Potential

Low

Foundations

Unlisted/Unknown

Nid Height

8
       
Seasonal Comparison

Weather Forecast

Dam Data Reference

Condition Assessment

Satisfactory
No 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

High
Dams 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.