Garvey Dam Reservoir Report

Last Updated: December 13, 2025

Garvey Dam, located in Stevens County, Washington, was completed in 1986 and serves primarily for irrigation purposes.


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Summary

This privately owned earth dam, with a structural height of 17 feet and a hydraulic height of 22 feet, has a storage capacity of 80 acre-feet and covers a surface area of 49 acres. The dam is situated on Truman Wood Creek, within the jurisdiction of the Washington Department of Ecology, and is regulated, permitted, inspected, and enforced by state authorities.

Despite being rated as having a low hazard potential and not yet assessed for condition, Garvey Dam plays a crucial role in water resource management in the region. With a maximum discharge capacity of 110 cubic feet per second and a drainage area of 1.95 square miles, the dam ensures the reliable supply of water for irrigation activities. While the dam has not been modified in recent years and lacks certain emergency preparedness measures, it remains a key infrastructure for sustaining agricultural operations in the area.

The dam's location, design, and operational features make it an essential component of the local water management system. As climate change continues to impact water resources, Garvey Dam's role in providing water for irrigation underscores the importance of maintaining and monitoring this critical infrastructure to ensure the resilience of the region's agricultural sector in the face of evolving environmental challenges.

Year Completed

1986

Dam Length

200

River Or Stream

Truman Wood Creek

Primary Dam Type

Earth

Surface Area

49

Hydraulic Height

22

Drainage Area

1.95

Nid Storage

80

Structural Height

17

Hazard Potential

Low

Foundations

Rock, Soil

Nid Height

22
       
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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.