Hamilton Reservoir Reservoir Report

Last Updated: December 6, 2025

Hamilton Reservoir in North Kingstown, Rhode Island, is a private water resource managed for fish and wildlife conservation purposes.


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Summary

Owned by a private entity, the reservoir falls under state regulation by the Department of Environmental Management (DS) and Coastal Resources Management Council (CRMC). The dam, primarily used for flood control, is an earth structure standing at 10 feet tall with a hydraulic height of 8 feet and a length of 200 feet, providing a storage capacity of 53 acre-feet and a surface area of 9 acres.

With a significant hazard potential, Hamilton Reservoir is inspected every five years, with the last assessment conducted in September 2014. Despite not being rated for condition assessment, the reservoir serves as an important habitat for local wildlife and contributes to the overall ecological balance of the area. The dam's spillway width is 26 feet, allowing for a maximum discharge of 730 cubic feet per second, ensuring the safety and stability of the surrounding community in the event of heavy rainfall or flooding. Water and climate enthusiasts are encouraged to explore this hidden gem in Washington County, Rhode Island, to appreciate the vital role it plays in preserving the region's natural resources and biodiversity.

Dam Length

200

Dam Height

10

River Or Stream

ANNAQUATUCKET RIVER

Primary Dam Type

Earth

Surface Area

9

Hydraulic Height

8

Drainage Area

7

Nid Storage

53

Structural Height

10

Hazard Potential

Significant

Nid Height

10
       
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.