Holmes Harbor Reclaimed Water Ponds Reservoir Report

Last Updated: December 15, 2025

Holmes Harbor Reclaimed Water Ponds, located in Island, Washington, is a remarkable water resource project that serves as a critical infrastructure for reclaiming water in the region.


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Summary

Owned by a public utility, the ponds are regulated by the Washington Dept of Ecology and have been in operation since 1994. The primary purpose of the ponds is for reclaiming water, with a storage capacity of 50 acre-feet and a surface area of 3.8 acres.

The dams at Holmes Harbor Reclaimed Water Ponds are of Earth type, with a hydraulic height of 50 feet and a structural height of 26 feet. The ponds have a high hazard potential but are currently in satisfactory condition, as assessed in 2014. The facility is subject to regular inspections every 5 years to ensure its safety and effectiveness in reclaiming water for various purposes. The location of the ponds, offstream from any river or stream, highlights their importance in managing water resources in the area.

Overall, Holmes Harbor Reclaimed Water Ponds play a crucial role in water management and conservation efforts in Washington. With its strategic design and operation, the facility contributes to sustainable water use and serves as a model for effective water resource infrastructure. As climate change continues to impact water availability, the ponds provide a valuable resource for reclaiming and reusing water, ensuring a resilient water supply for the community and ecosystem.

Year Completed

1994

Dam Length

2200

River Or Stream

Offstream

Primary Dam Type

Earth

Surface Area

3.8

Hydraulic Height

50

Drainage Area

0.01

Nid Storage

50

Structural Height

26

Hazard Potential

High

Foundations

Soil

Nid Height

50
       
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.