Chambers Creek Reservoir Dam Reservoir Report

Last Updated: December 15, 2025

Chambers Creek Reservoir Dam, located in Pierce County, Washington, was completed in 1970 and serves as a crucial water supply structure in the region.


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Summary

The dam, standing at a hydraulic height of 22 feet and a structural height of 16 feet, is primarily made of earth with a roller-compacted concrete core. With a normal storage capacity of 89 acre-feet and a maximum storage capacity of 111 acre-feet, the dam plays a key role in managing water resources for the area.

Owned privately and regulated by the Washington Department of Ecology, Chambers Creek Reservoir Dam is designed to withstand low hazard potential according to the data provided. The dam overlooks Chambers Creek, with a drainage area of 108 square miles and a surface area of 5 acres. While the dam itself has not been rated for condition assessment, it is inspected, regulated, and permitted by the state authorities, ensuring its safety and functionality for water supply purposes.

Congressional District 10 in Washington, represented by Denny Heck, houses the Chambers Creek Reservoir Dam within its jurisdiction. The dam does not have associated structures or outlet gates, emphasizing its simplicity and efficiency in water management. With a history of serving the community for over five decades, the dam stands as a vital infrastructure ensuring water availability and security for the residents of Pierce County and beyond.

Year Completed

1970

Dam Length

170

River Or Stream

Chambers Creek

Primary Dam Type

Earth

Surface Area

5

Hydraulic Height

22

Drainage Area

108

Nid Storage

111

Structural Height

16

Hazard Potential

Low

Foundations

Soil

Nid Height

22
       
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.