Longview Sewage Lagoon No 2 Reservoir Report
Last Updated: December 14, 2025
Longview Sewage Lagoon No 2, located in Longview, Washington, is a crucial water resource managed by the local government.
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Summary
This sewage lagoon serves as a treatment facility for wastewater, helping to protect the nearby Tr-Coal Creek Slough-Offstream from pollution. Constructed in 1986, this Earth-type dam has a hydraulic height of 11 feet and a structural height of 4 feet, with a storage capacity of 81 acre-feet and a surface area of 28 acres.
Despite its low hazard potential and current "Not Rated" condition assessment, Longview Sewage Lagoon No 2 is regulated by the Washington Dept of Ecology and undergoes regular state inspections and enforcement to ensure compliance with environmental standards. With a maximum discharge rate of 8 cubic feet per second, this sewage lagoon plays a vital role in managing wastewater in the region. Additionally, Longview Sewage Lagoon No 2 is located in Congressional District 03, Washington, represented by Jaime Herrera Beutler (R), highlighting its significance in the local infrastructure and water management efforts.
Overall, Longview Sewage Lagoon No 2 serves as an essential water resource in Cowlitz County, Washington, contributing to the protection of water quality and environmental sustainability in the area. With its state-regulated status and adherence to inspection and enforcement protocols, this sewage lagoon plays a crucial role in managing wastewater and protecting the surrounding ecosystem. Its location, design, and operational capacity make it a key infrastructure asset in the region's water resource management efforts.
Year Completed |
1986 |
Dam Length |
2230 |
River Or Stream |
Tr-Coal Creek Slough-Offstream |
Primary Dam Type |
Earth |
Surface Area |
28 |
Hydraulic Height |
11 |
Drainage Area |
0.04 |
Nid Storage |
81 |
Structural Height |
4 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
11 |
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.
Area Campgrounds
| Location | Reservations | Toilets |
|---|---|---|
Hudson - Parcher County Park
|
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County Line Park
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Clatskanie City Park
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Longview Sewage Lagoon No 2