Davenport Sewage Lagoon No 1 Reservoir Report
Last Updated: December 15, 2025
Davenport Sewage Lagoon No 1, located in Lincoln County, Washington, is a vital water resource managed by the local government.
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Summary
This facility, constructed in 1993, serves as a crucial component in wastewater treatment for the city of Davenport. With a primary purpose designated as 'Other', the lagoon plays a significant role in maintaining the health and cleanliness of the surrounding environment, particularly in managing sewage and runoff from the area.
With a high hazard potential and fair condition assessment, the lagoon poses potential risks that are closely monitored and regulated by the Washington Department of Ecology. The dam structure, primarily composed of earth and rockfill, stands at a hydraulic height of 24 feet and spans a length of 1600 feet. The facility has a maximum storage capacity of 45 acre-feet and a normal storage level of 39 acre-feet, ensuring sufficient capacity to handle wastewater discharge from the community.
Despite its critical role in maintaining water quality and environmental health, Davenport Sewage Lagoon No 1 has undergone limited modifications and inspections in recent years. The last inspection conducted in July 2016 reported a fair condition assessment, highlighting the need for regular monitoring and maintenance to ensure the facility's continued effectiveness and safety. As climate change impacts water resources, maintaining and upgrading infrastructure like the Davenport Sewage Lagoon becomes increasingly important in safeguarding public health and the environment.
Year Completed |
1993 |
Dam Length |
1600 |
River Or Stream |
Tr-Cottonwood Creek-Offstream |
Primary Dam Type |
Earth |
Surface Area |
39 |
Hydraulic Height |
24 |
Drainage Area |
0.01 |
Nid Storage |
45 |
Structural Height |
22 |
Hazard Potential |
High |
Foundations |
Soil |
Nid Height |
24 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Chamokane Creek Below Falls Near Long Lake
|
32cfs |
Coal Creek At Mohler
|
1cfs |
Spokane River Below Nine Mile Dam At Spokane
|
17300cfs |
Little Spokane River Near Dartford
|
527cfs |
Hangman Creek At Spokane
|
98cfs |
Spokane River At Spokane
|
17500cfs |
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.
Davenport Sewage Lagoon No 1