Warren Upper Reservoir Dam Reservoir Report

Last Updated: December 19, 2025

Warren Upper Reservoir Dam, located in Rehoboth, Massachusetts, is a rockfill dam built in 1911 primarily for water supply purposes.


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Summary

The dam stands at a height of 19 feet, with a hydraulic height of 17 feet, and a length of 740 feet. It has a storage capacity of 950 acre-feet, with a normal storage level of 690 acre-feet, serving the surrounding area with a surface area of 126 acres and a drainage area of 3.79 square miles. The dam is regulated by the Department of Conservation and Recreation in Massachusetts and is subject to state inspection and enforcement.

The dam poses a significant hazard potential, although its condition was assessed as satisfactory during the last inspection in July 2015. The dam has an inspection frequency of 5 years, with a moderate risk rating of 3. While there are no associated locks or spillways, the dam's spillway type is uncontrolled, with a spillway width of 0 feet. Despite its age, the dam has been maintained well, meeting regulatory guidelines and ensuring the safety of the surrounding area in case of emergencies.

Warren Upper Reservoir Dam is a vital infrastructure for the region, providing essential water supply services and contributing to the overall water resource management in the area. Climate and water resource enthusiasts can appreciate the historical significance and engineering feat of this dam, which continues to serve its intended purpose effectively while adhering to state regulations and safety standards.

Year Completed

1911

Dam Length

740

Dam Height

19

River Or Stream

BAD LUCK BROOK

Primary Dam Type

Rockfill

Surface Area

126

Hydraulic Height

17

Drainage Area

3.79

Nid Storage

950

Hazard Potential

Significant

Foundations

Unlisted/Unknown

Nid Height

19
       
Seasonal Comparison

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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.