Loon Lake Waste Storage Lagoon Reservoir Report
Last Updated: December 5, 2025
Loon Lake Waste Storage Lagoon in Stevens, Washington, is a public utility facility regulated by the Washington Dept of Ecology.
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Summary
Completed in 1986, this Earth dam stands 10 feet high with a hydraulic height of 10 feet, serving as a storage reservoir with a capacity of 76 acre-feet. The lagoon covers a surface area of 7 acres and has a normal storage level of 63 acre-feet, situated offstream from the Tr-Loon Lake waterbody.
This high-hazard potential structure has been deemed satisfactory in its condition assessment as of May 2018, with inspections conducted every 5 years. The emergency action plan was last revised in December 2018, ensuring preparedness for any unforeseen events. While no spillway or outlet gates are specified, the dam's risk assessment and management measures are not provided in the data. With its crucial role in waste storage and management, Loon Lake Waste Storage Lagoon remains a key infrastructure in the region's environmental conservation efforts.
For water resource and climate enthusiasts, Loon Lake Waste Storage Lagoon represents a critical piece of infrastructure in Washington's water management system. Its strategic location and design highlight the importance of sustainable waste storage practices in protecting the surrounding environment. With ongoing inspections and a high-hazard potential designation, this lagoon serves as a reminder of the delicate balance between human activities and natural ecosystems, urging stakeholders to prioritize safety and environmental stewardship in their operations.
Year Completed |
1986 |
River Or Stream |
Tr-Loon Lake-Offstream |
Primary Dam Type |
Earth |
Surface Area |
7 |
Hydraulic Height |
10 |
Drainage Area |
0.02 |
Nid Storage |
76 |
Structural Height |
10 |
Hazard Potential |
High |
Foundations |
Rock, Soil |
Nid Height |
10 |
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 Waste Storage Lagoon