Muth Stormwater Pond Reservoir Report

Last Updated: December 15, 2025

Muth Stormwater Pond, located in Kent, Washington, was designed by Ed McCarthy to serve as a flood risk reduction structure along the Green River.


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Summary

Completed in 2007, this earth dam stands at a hydraulic height of 9.5 feet and a structural height of 12 feet, with a storage capacity of 37 acre-feet. With a surface area of 4.9 acres and a drainage area of 0.06 square miles, this pond plays a critical role in managing stormwater runoff and reducing the risk of flooding in the region.

The Muth Stormwater Pond is owned and regulated by the Washington Department of Ecology, and it undergoes regular inspections to ensure its structural integrity and functionality. Despite its high hazard potential, the pond has been assessed to be in satisfactory condition, with its last inspection conducted in February 2015. With a primary purpose of flood risk reduction, this pond serves as a vital infrastructure asset in safeguarding the surrounding communities from potential water-related disasters.

As a key component of the local government's flood risk mitigation strategy, the Muth Stormwater Pond not only provides essential storage capacity for stormwater but also contributes to overall water resource management in the region. With its strategic location and effective design, this pond exemplifies the importance of sustainable water infrastructure in addressing the challenges posed by climate change and extreme weather events.

Year Completed

2007

River Or Stream

Green River - offstream

Primary Dam Type

Earth

Surface Area

4.9

Hydraulic Height

9.5

Drainage Area

0.06

Nid Storage

37

Structural Height

12

Hazard Potential

High

Foundations

Soil

Nid Height

12
       
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.