Bonney Lake Wsu Infiltration Pond Reservoir Report

Last Updated: December 15, 2025

Bonney Lake Wsu Infiltration Pond, located in Pierce County, Washington, is a local government-owned facility designed by Barghausen Consulting Engineers for flood risk reduction.


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Summary

Completed in 2018, this offstream earth dam is 5 feet high with a hydraulic height of 5 feet and a length of 1000 feet. The pond has a storage capacity of 35 acre-feet, with a normal storage of 30 acre-feet and a surface area of 13.2 acres. It serves the primary purpose of flood risk reduction and is regulated by the Washington Department of Ecology.

Although the pond has a high hazard potential, its condition assessment in August 2018 deemed it satisfactory. With a 5-year inspection frequency, the facility meets state permitting, inspection, and enforcement requirements. While no emergency action plan (EAP) was prepared at the time of data update, the facility is equipped to handle emergencies and ensure public safety. The Bonney Lake Wsu Infiltration Pond plays a crucial role in managing stormwater and reducing flood risks in the area, showcasing the intersection of water resource management and climate resilience efforts.

Year Completed

2018

Dam Length

1000

River Or Stream

Offstream

Primary Dam Type

Earth

Surface Area

13.2

Hydraulic Height

5

Drainage Area

0.2

Nid Storage

35

Structural Height

5

Hazard Potential

High

Foundations

Soil

Nid Height

5
       
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.