Leach Creek Stormwater Detention Dam Reservoir Report
Last Updated: December 15, 2025
The Leach Creek Stormwater Detention Dam, located within the city limits of Fircrest, Washington, is a crucial structure designed by the City of Tacoma to mitigate flood risks in the region.
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Summary
Completed in 1960, this earth dam stands at a hydraulic height of 13 feet, with a length of 1000 feet and a storage capacity of 183 acre-feet. Situated on Leach Creek, the dam plays a vital role in reducing the impact of heavy rainfall events and managing stormwater runoff in the area.
Managed and regulated by the Washington Department of Ecology, this dam is inspected every five years to ensure its structural integrity and effectiveness in flood risk reduction. With a fair condition assessment and a high hazard potential, the Leach Creek Stormwater Detention Dam serves as a critical infrastructure for protecting the surrounding community from potential flooding events. Its location within Congressional District 10, Washington, underscores its importance in safeguarding the environment and residents in Pierce County.
As an essential component of the local government's flood management strategy, the Leach Creek Stormwater Detention Dam exemplifies the collaborative effort between state agencies and municipalities in safeguarding water resources and addressing climate-related challenges. With its significant storage capacity and hydraulic height, this earth dam stands as a testament to the commitment to resilience and sustainability in the face of increasing climate variability and extreme weather events in the Pacific Northwest.
Year Completed |
1960 |
Dam Length |
1000 |
River Or Stream |
Leach Creek |
Primary Dam Type |
Earth |
Surface Area |
1 |
Hydraulic Height |
13 |
Drainage Area |
3.67 |
Nid Storage |
183 |
Structural Height |
13 |
Hazard Potential |
High |
Foundations |
Soil |
Nid Height |
13 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Dam Data Reference
Condition Assessment
SatisfactoryNo 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
HighDams 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.
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Leach Creek Stormwater Detention Dam
10th Street Northwest 4366, Pierce County