Fairfield Sewage Aerated Lagoon - Lagoon 1 Reservoir Report
Last Updated: December 15, 2025
Fairfield Sewage Aerated Lagoon - Lagoon 1, located in Spokane, Washington, is a crucial water resource managed by the local government with oversight from the Washington Dept of Ecology.
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Summary
This lagoon, constructed in 2003 by Century West Engineering, serves as a key component in the treatment of sewage and wastewater in the area. With a hydraulic height of 13.4 feet and a structural height of 12 feet, this earth dam structure has a normal storage capacity of 9.5 acre-feet and a maximum storage of 14 acre-feet.
This significant facility covers a surface area of 2 acres and plays a vital role in water quality management and environmental protection in the region. The dam, primarily designed for sewage treatment purposes, is in fair condition as of the last inspection in September 2021 and is subject to regular inspections to ensure its continued functionality and safety. With a hazard potential deemed significant, the lagoon is equipped to handle emergencies and has protocols in place for risk management and mitigation.
Fairfield Sewage Aerated Lagoon - Lagoon 1, while not a traditional dam, represents a critical infrastructure for water treatment and management in the area. As part of a comprehensive sewage treatment system, this facility contributes to maintaining water quality standards and protecting the environment. With a focus on regulatory compliance and operational effectiveness, this lagoon stands as a testament to the importance of sustainable water resource management and climate resilience efforts in the region.
Year Completed |
2003 |
Dam Length |
650 |
Primary Dam Type |
Earth |
Surface Area |
2 |
Hydraulic Height |
13.4 |
Nid Storage |
14 |
Structural Height |
12 |
Hazard Potential |
Significant |
Foundations |
Soil |
Nid Height |
13 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Hangman Creek At State Line Road Near Tekoa
|
37cfs |
Coeur D Alene River Nr Harrison Id
|
47cfs |
Hangman Creek At Spokane
|
97cfs |
Spokane River At Spokane
|
18600cfs |
St Joe River Nr Chatcolet Id
|
802cfs |
Spokane River Nr Post Falls Id
|
20800cfs |
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.
Fairfield Sewage Aerated Lagoon - Lagoon 1