Lyon Lake Dam Reservoir Report
Last Updated: December 13, 2025
Lyon Lake Dam, located in Grant County, Washington, was completed in 1971 and serves primarily for recreational purposes.
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Summary
This earth dam with stone core types stands at a hydraulic height of 13 feet and a structural height of 9 feet, creating a reservoir with a storage capacity of 68 acre-feet. The dam is regulated and inspected by the Washington Department of Ecology, ensuring its safety and compliance with state regulations.
Situated on Tr-Crab Creek, Lyon Lake Dam poses a low hazard potential and has not been rated for its condition. Despite not having an Emergency Action Plan (EAP) in place or meeting certain guidelines, the dam continues to provide essential water resource management and recreational opportunities for the surrounding community. With its location within Congressional District 04, Washington, Lyon Lake Dam stands as a testament to responsible water infrastructure development and management in the region.
Overall, Lyon Lake Dam represents a vital piece of water resource infrastructure in Washington, offering both recreational benefits and water management capabilities. While it may not be without its challenges in terms of emergency preparedness and condition assessment, the dam serves as a crucial asset for the local area and underscores the importance of sustainable water resource practices in the face of climate change.
Year Completed |
1971 |
Dam Length |
530 |
River Or Stream |
Tr-Crab Creek |
Primary Dam Type |
Earth |
Surface Area |
18 |
Hydraulic Height |
13 |
Drainage Area |
2.96 |
Nid Storage |
68 |
Structural Height |
9 |
Hazard Potential |
Low |
Foundations |
Rock, Soil |
Nid Height |
13 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Crab Creek Near Moses Lake
|
28cfs |
Crab Creek At Irby
|
2cfs |
Wilson Creek Below Corbett Draw Near Almira
|
0cfs |
Crab Creek Near Beverly
|
160cfs |
Chelan River At Chelan
|
770cfs |
Coal Creek At Mohler
|
1cfs |
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.
Lyon Lake Dam
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