Locke Dam Reservoir Report

Last Updated: December 5, 2025

Locke Dam, located in Locke, Washington, along the Tr-Pend Oreille River, was completed in 1973 with the primary purpose of flood risk reduction.


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Summary

This private dam, regulated by the Washington Dept of Ecology, has a hydraulic height of 30 feet and a structural height of 21 feet. The dam has a hazard potential rated as high, with a fair condition assessment as of June 2018.

With a storage capacity of 1860 acre-feet and a drainage area of 1.16 square miles, Locke Dam plays a crucial role in managing water resources in the region. The dam's normal storage capacity is 1000 acre-feet, providing flood protection to the surrounding area. The dam's last inspection was conducted in October 2017, with a scheduled inspection frequency of 5 years to ensure its continued safety and effectiveness in mitigating flood risks.

Locke Dam serves as a vital infrastructure for flood risk management in Pend Oreille County, Washington, under the ownership of a private entity. As climate change continues to pose challenges to water resources management, the proper maintenance and operation of dams like Locke Dam are essential for safeguarding communities and ecosystems from the impacts of extreme weather events. Further monitoring and risk management measures will be crucial in ensuring the continued effectiveness of Locke Dam in protecting the region from potential flood hazards.

Year Completed

1973

River Or Stream

Tr-Pend Oreille River

Primary Dam Type

Earth

Surface Area

1000

Hydraulic Height

30

Drainage Area

1.16

Nid Storage

1860

Structural Height

21

Hazard Potential

High

Foundations

Soil

Nid Height

30
       
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.