Jays Pond Dam Reservoir Report

Last Updated: December 15, 2025

Jays Pond Dam, located in San Juan, Washington, serves as a crucial water supply source for the region.


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Summary

Completed in 1973, this earth dam stands at a hydraulic height of 9 feet and a structural height of 8 feet, with a maximum storage capacity of 19 acre-feet. The dam's primary purpose is water supply, although it also supports recreational activities in the area.

Managed by a private owner, Jays Pond Dam falls under the regulatory oversight of the Washington Department of Ecology. With a high hazard potential but a satisfactory condition assessment as of June 2018, the dam undergoes inspections every five years to ensure its safety and functionality. The emergency action plan for the dam was last revised in May 2019, indicating a commitment to preparedness and risk management.

Despite its modest surface area of 3.1 acres and drainage area of 0.03 square miles, Jays Pond Dam plays a significant role in water resource management in the region. Its presence on Tr-Deer Harbor ensures a stable water supply for the community while also offering opportunities for recreational enjoyment. As climate change continues to impact water resources, the maintenance and regulation of dams like Jays Pond Dam are essential for sustainable water management in the face of evolving environmental challenges.

Year Completed

1973

River Or Stream

Tr-Deer Harbor

Primary Dam Type

Earth

Surface Area

3.1

Hydraulic Height

9

Drainage Area

0.03

Nid Storage

19

Structural Height

8

Hazard Potential

High

Foundations

Soil

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.