Panther Lake Ballfield Dam Reservoir Report

Last Updated: December 14, 2025

Panther Lake Ballfield Dam, also known as Panther Lake Detention Dam, is a privately owned structure located in Federal Way, Washington.


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Summary

Completed in 1994, this earth dam stands at a hydraulic height of 15 feet and a structural height of 7 feet, serving primarily for flood risk reduction in the area. The dam has a storage capacity of 102 acre-feet and is situated offstream, covering a drainage area of 2.05 square miles.

Despite being in fair condition as of the last assessment in 2017, Panther Lake Ballfield Dam has a high hazard potential and undergoes regular inspections every five years. The dam has been modified structurally in 1995 to enhance its effectiveness in flood risk reduction. While there are no spillways or outlet gates associated with the dam, its presence plays a crucial role in managing water flow and protecting the surrounding community from potential inundation. With its strategic location and purposeful design, Panther Lake Ballfield Dam stands as a vital infrastructure contributing to water resource management and climate resilience efforts in the region.

Years Modified

1995 - Structural

Year Completed

1994

River Or Stream

Offstream

Primary Dam Type

Earth

Hydraulic Height

15

Drainage Area

2.05

Nid Storage

102

Structural Height

7

Hazard Potential

High

Foundations

Soil

Nid Height

15
       
Seasonal Comparison

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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.