Davenport Sewage Lagoon No 2 Reservoir Report
Last Updated: December 15, 2025
Davenport Sewage Lagoon No 2 in Lincoln, Washington, is a crucial water resource managed by the local government.
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Summary
Constructed in 1987, this earth-type dam serves a primary purpose of wastewater management for the city of Davenport. With a storage capacity of 53 acre-feet and a surface area of 7.8 acres, this lagoon plays a vital role in maintaining the environmental health of the region.
Situated near Tr-Cottonwood Creek-Offstream, the dam stands at a hydraulic height of 9 feet, ensuring effective containment of sewage and runoff. While the condition assessment reports it as fair, the hazard potential is considered high, warranting regular inspections and maintenance. The Washington Dept of Ecology oversees the state permitting, inspection, and enforcement of this structure, ensuring compliance with environmental regulations and safeguarding the local water resources.
Despite its critical importance, Davenport Sewage Lagoon No 2 has not undergone recent modifications or risk assessments. The emergency action plan (EAP) status and risk management measures remain unclear, highlighting the need for updated guidelines and preparedness in the face of potential hazards. As climate change continues to impact water resources, it is essential for authorities to prioritize the safety and sustainability of infrastructure like this sewage lagoon to mitigate environmental risks and protect the surrounding ecosystem.
Year Completed |
1987 |
Dam Length |
2100 |
River Or Stream |
Tr-Cottonwood Creek-Offstream |
Primary Dam Type |
Earth |
Surface Area |
7.8 |
Hydraulic Height |
9 |
Drainage Area |
0.01 |
Nid Storage |
53 |
Structural Height |
9 |
Hazard Potential |
High |
Foundations |
Soil |
Nid Height |
9 |
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 2