Reardan Sewage Lagoon Reservoir Report

Last Updated: December 15, 2025

Reardan Sewage Lagoon, located in Reardan, Washington, was designed by Century West and completed in 2006.


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Summary

This sewage lagoon serves as a crucial infrastructure for the local government, with a storage capacity of 22 acre-feet and a surface area of 4.26 acres. The lagoon has a hydraulic height of 8 feet and a structural height of 8 feet, making it an essential component of the region's wastewater management system.

Despite its importance, the Reardan Sewage Lagoon poses a high hazard potential, although its condition was assessed as fair during the last inspection in 2016. The lagoon is regulated by the Washington Department of Ecology, ensuring that it meets state permitting, inspection, and enforcement requirements. As a key piece of infrastructure in Lincoln County, Washington, the Reardan Sewage Lagoon plays a vital role in protecting water resources and managing wastewater in the area.

Water resource and climate enthusiasts will appreciate the significance of the Reardan Sewage Lagoon in maintaining water quality and environmental sustainability in the region. With its state-regulated status and high hazard potential, this lagoon serves as a reminder of the importance of proper wastewater treatment and management practices in safeguarding our water resources for future generations.

Year Completed

2006

Dam Length

1700

Primary Dam Type

Earth

Surface Area

4.26

Hydraulic Height

8

Nid Storage

22

Structural Height

8

Hazard Potential

High

Nid Height

8
       
Seasonal Comparison

Weather Forecast

Dam Data Reference

Condition Assessment

Satisfactory
No 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

High
Dams 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.