Lakemont Stormwater Pond Reservoir Report

Last Updated: December 25, 2025

Lakemont Stormwater Pond, also known as High Park Detention Pond, is a vital infrastructure in Bellevue, Washington, designed for flood risk reduction.


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Summary

Managed by the local government and regulated by the Washington Dept of Ecology, this earth dam structure is situated along Lewis Creek, with a capacity of 30 acre-feet for storage and a drainage area of 0.4 square miles. Completed in 1992, the pond has a hydraulic height of 13 feet and a maximum discharge capacity of 581 cubic feet per second, serving as a crucial defense against potential flooding events in the area.

With a satisfactory condition assessment and a high hazard potential rating, Lakemont Stormwater Pond plays a crucial role in mitigating flood risks for the surrounding community. The structure has a surface area of 10 acres and provides normal storage of 10 acre-feet, ensuring efficient water management in the region. Despite its importance, the pond has not been modified since its completion and undergoes regular inspections every five years to maintain its functionality. With emergency action plans in place and a solid risk management strategy, the pond stands as a reliable resource for safeguarding against potential water-related hazards in the area.

As a key asset in flood risk reduction, Lakemont Stormwater Pond exemplifies the importance of sustainable water resource management in addressing climate-related challenges. Located in King County, Washington, this earth dam structure not only serves as a protective barrier against potential inundation but also highlights the critical role of local governments in ensuring the safety and well-being of their communities. With a focus on environmental stewardship and strategic infrastructure planning, the pond stands as a testament to proactive measures in addressing water-related risks and enhancing resilience in the face of a changing climate.

Year Completed

1992

Dam Length

930

River Or Stream

Lewis Creek

Primary Dam Type

Earth

Surface Area

10

Hydraulic Height

13

Drainage Area

0.4

Nid Storage

30

Structural Height

13

Hazard Potential

High

Foundations

Rock, Soil

Nid Height

13
       
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.