Pocasset Pond Reservoir Report

Last Updated: December 6, 2025

Pocasset Pond, located in Johnston, Rhode Island, is a significant water resource managed by the local government.


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Summary

This earth dam structure was completed in 1951 and serves multiple purposes beyond flood control, making it a unique and versatile asset for the community. With a height of 8.5 feet and a storage capacity of 15 acre-feet, Pocasset Pond plays a crucial role in regulating the flow of the Pocasset River and providing recreational opportunities for residents.

Despite being state-regulated and regularly inspected, the condition assessment of Pocasset Pond is currently marked as 'Not Rated,' indicating the need for further evaluation. With a significant hazard potential, it is essential for local authorities to prioritize risk management measures and emergency preparedness to ensure the safety and functionality of this water resource. Additionally, the involvement of federal agencies in funding, designing, and constructing the dam underscores the importance of collaborative efforts in maintaining the integrity of Pocasset Pond for the long term.

As a prominent feature in the Providence County landscape, Pocasset Pond serves as a valuable habitat for wildlife and a source of water supply for the surrounding area. With a maximum discharge capacity of 297 cubic feet per second and a spillway width of 24 feet, this reservoir has the capability to manage large volumes of water effectively. By staying informed about the latest updates and management practices related to Pocasset Pond, water resource and climate enthusiasts can contribute to the preservation and sustainable use of this vital infrastructure for future generations.

Year Completed

1951

Dam Length

170

Dam Height

8.5

River Or Stream

POCASSET RIVER

Primary Dam Type

Earth

Surface Area

5

Hydraulic Height

5

Drainage Area

3

Nid Storage

15

Structural Height

8

Hazard Potential

Significant

Nid Height

9
       
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.