Loon Lake Control Structure Reservoir Report
Last Updated: December 5, 2025
The Loon Lake Control Structure, also known as the Loon Lake Dam, is a privately owned gravity dam located in Springdale, Washington.
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Summary
Completed in 1951, this multi-arch dam stands at a height of 8 feet with a structural height of 5 feet and a length of 25 feet. Its primary purpose is for recreation, offering a serene setting for water resource and climate enthusiasts to enjoy the 279-acre surface area.
Managed by the Washington Department of Ecology, the Loon Lake Control Structure is state-regulated and inspected to ensure its fair condition and low hazard potential. With a normal storage capacity of 5590 acre-feet, this dam has become a vital part of the recreational landscape in Stevens County, Washington. Despite its low hazard potential, the dam's emergency preparedness and risk management measures remain undisclosed, highlighting the importance of ongoing monitoring and maintenance.
As part of Congressional District 05 in Washington, the Loon Lake Control Structure serves as a reminder of the delicate balance between water resource management and climate resilience. Its presence on Tr-Sheep Creek offers a tranquil retreat for outdoor enthusiasts while underscoring the need for responsible stewardship of our natural resources in the face of changing climate patterns.
Year Completed |
1951 |
Dam Length |
25 |
River Or Stream |
Tr-Sheep Creek |
Primary Dam Type |
Gravity |
Surface Area |
279 |
Hydraulic Height |
8 |
Nid Storage |
5590 |
Structural Height |
5 |
Hazard Potential |
Low |
Foundations |
Rock, Soil |
Nid Height |
8 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
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.
Loon Lake Control Structure