Koura Dam Reservoir Report

Last Updated: December 16, 2025

Koura Dam, located in Kitsap, Washington, was completed in 1949 with the primary purpose of irrigation.


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Summary

The dam is privately owned and regulated by the Washington Department of Ecology, with state jurisdiction, permitting, inspection, and enforcement in place. The earth dam stands at a hydraulic height of 28 feet, providing a storage capacity of 10 acre-feet and covering a surface area of 9 acres. The drainage area for the dam is 0.08 square miles, with a high hazard potential and a poor condition assessment as of May 2018.

The dam is situated on Tr-Murden Cove, within the Seattle District and Congressional District 06 of Washington. The structure is primarily made of stone core and rests on a soil foundation. Despite its high hazard potential, the dam has not undergone any modifications in recent years and lacks specific risk management measures or emergency action plans. The last inspection conducted on the dam was in August 2017, with an inspection frequency of 5 years. Overall, Koura Dam serves as a critical water resource for irrigation in the region, but its condition and hazard potential warrant careful monitoring and maintenance moving forward.

Year Completed

1949

River Or Stream

Tr-Murden Cove

Primary Dam Type

Earth

Surface Area

9

Hydraulic Height

28

Drainage Area

0.08

Nid Storage

10

Structural Height

28

Hazard Potential

High

Foundations

Soil

Nid Height

28
       
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.