Lily Lake Dam Reservoir Report
Nearby: Clear Lake Saddle Dam Clear Lake Dam
Last Updated: December 12, 2025
Lily Lake Dam, located in Malaga, Washington, was completed in 1892 and serves as a vital structure for irrigation and recreation purposes.
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Summary
The dam, primarily made of earth and stone materials with a structural height of 14 feet, holds a maximum storage capacity of 420 acre-feet and covers a surface area of 16 acres. With a drainage area of 0.43 square miles and a maximum discharge of 47 cubic feet per second, the dam plays a crucial role in managing water resources in the region.
Owned by a public utility and regulated by the Washington Department of Ecology, Lily Lake Dam is inspected every five years to ensure its structural integrity and safety. The dam has a high hazard potential but was assessed to be in satisfactory condition as of May 2021. Additionally, the dam's emergency action plan (EAP) was last revised in January 2020, indicating a proactive approach to emergency preparedness and risk management. With its picturesque setting and important role in water resource management, Lily Lake Dam stands as a testament to the intersection of human infrastructure and environmental stewardship in the region.
As climate change continues to impact water resources, Lily Lake Dam serves as a critical infrastructure for adapting to changing hydrological conditions. The dam's location along Tr-Stemilt Creek to Columbia River provides vital water storage for irrigation and recreational activities in the area. With its historic significance and ongoing regulatory oversight, Lily Lake Dam exemplifies the importance of sustainable water management practices in the face of evolving climate challenges.
Year Completed |
1892 |
Dam Length |
500 |
River Or Stream |
Tr-Stemilt Creek to Columbia R |
Primary Dam Type |
Earth |
Surface Area |
16 |
Hydraulic Height |
14 |
Drainage Area |
0.43 |
Nid Storage |
420 |
Structural Height |
14 |
Hazard Potential |
High |
Foundations |
Soil |
Nid Height |
14 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Wenatchee River At Monitor
|
36300cfs |
Wenatchee River At Peshastin
|
35500cfs |
Entiat River Near Entiat
|
1950cfs |
Icicle Creek Above Snow Creek Near Leavenworth
|
5180cfs |
Mad River At Ardenvoir
|
368cfs |
Yakima River At Umtanum
|
16400cfs |
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.
Lily Lake Dam
Apple Capital Recreation Loop Trail, East Wenatchee