Sprague Wastewater Treatment Lagoons Reservoir Report
Nearby: Brown Dam Lincoln Co Hog Lake Dam
Last Updated: December 13, 2025
The Sprague Wastewater Treatment Lagoons in Lincoln, Washington, are a vital part of the local government's efforts to manage and treat wastewater in the area.
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Summary
Owned and regulated by the Washington Department of Ecology, these lagoons play a crucial role in ensuring that water resources are protected and preserved for future generations. With a high hazard potential but a fair condition assessment, the lagoons have been in operation since 1993 and provide a maximum storage capacity of 157 acre-feet.
Situated offstream and designed as an earth dam with rockfill core types, the Sprague Wastewater Treatment Lagoons cover a surface area of 107 acres and have a drainage area of 10 acres. With a hydraulic height of 14 feet, these lagoons have a maximum discharge of 1 cubic feet per second. Despite their high hazard potential, the lagoons have been inspected regularly, with the last inspection conducted in June 2016.
Climate and water resource enthusiasts will appreciate the role that the Sprague Wastewater Treatment Lagoons play in managing wastewater in the region and ensuring that water quality is maintained. As a critical infrastructure owned by the local government and regulated by the state, these lagoons demonstrate the importance of responsible water management practices in safeguarding the environment and public health. With ongoing inspections and a commitment to meeting regulatory guidelines, the Sprague Wastewater Treatment Lagoons serve as a model for sustainable water resource management in Washington state.
Year Completed |
1993 |
Dam Length |
3570 |
River Or Stream |
Offstream |
Primary Dam Type |
Earth |
Surface Area |
107 |
Hydraulic Height |
14 |
Drainage Area |
10 |
Nid Storage |
157 |
Structural Height |
14 |
Hazard Potential |
High |
Foundations |
Rock, Soil |
Nid Height |
14 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Coal Creek At Mohler
|
1cfs |
Hangman Creek At Spokane
|
102cfs |
Spokane River At Spokane
|
14500cfs |
Spokane River Below Nine Mile Dam At Spokane
|
13400cfs |
Palouse River At Hooper
|
574cfs |
Chamokane Creek Below Falls Near Long Lake
|
33cfs |
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.
Sprague Wastewater Treatment Lagoons
State Route 23 Sprague
Hog Lake Boat Ramp