Glen Rock Reservoir Reservoir Report

Last Updated: December 6, 2025

Glen Rock Reservoir, also known as Usquepaug, is a private-owned water resource located in South Kingstown, Rhode Island.


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Summary

The reservoir, completed in 1860, serves multiple purposes including recreation and other activities. With a dam height of 7 feet and a storage capacity of 125 acre-feet, Glen Rock Reservoir covers a surface area of 15 acres and has a drainage area of 33 square miles.

Situated along the Usquepaug River, the reservoir has a significant hazard potential and is subject to regular inspections with an inspection frequency of 5 years. With a spillway width of 106 feet and a maximum discharge capacity of 371 cubic feet per second, Glen Rock Reservoir plays a crucial role in managing water flow and ensuring safety in the surrounding area. The reservoir offers a serene setting for water resource and climate enthusiasts to appreciate the beauty of nature while also understanding the importance of maintaining and managing water resources effectively.

Despite not being state-regulated, Glen Rock Reservoir remains a vital water resource within the region, providing opportunities for recreational activities and serving as a source of water storage. With its historical significance dating back to the 19th century, the reservoir continues to be a key component in the local ecosystem, offering a glimpse into the intersection of human activity and natural landscapes in the context of water resource management and climate resilience.

Year Completed

1860

Dam Length

300

Dam Height

7

River Or Stream

USQUEPAUG RIVER

Primary Dam Type

Rockfill

Surface Area

15

Hydraulic Height

7

Drainage Area

33

Nid Storage

125

Structural Height

8

Hazard Potential

Significant

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.