Sacheen Lake Wwtp Lagoons Reservoir Report

Last Updated: December 5, 2025

Sacheen Lake Wwtp Lagoons, located in Pend Oreille, Washington, is a water resource facility under the jurisdiction of the Washington Dept of Ecology.


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Summary

Completed in 2016, the lagoons serve as a vital component of the state's water management system, with a primary purpose listed as "Other." The lagoons have a structural height of 15 feet and a hydraulic height of 13 feet, providing a storage capacity of 120.6 acre-feet and a normal storage level of 38 acre-feet.

The facility covers a surface area of 10.13 acres and has a drainage area of 0.02 acres, with a high hazard potential and fair condition assessment. The last inspection date conducted in August 2021 revealed a need for regular monitoring and maintenance, with an inspection frequency of 5 years. Despite the high hazard potential, the lagoons have not been modified since their completion and do not feature any outlet gates or associated structures.

In the event of an emergency, the facility's Emergency Action Plan (EAP) status and preparedness remain undisclosed, raising concerns about the ability to effectively manage risks and respond to potential incidents. As water resource and climate enthusiasts, it is essential to monitor and advocate for the maintenance and improvement of critical infrastructure like Sacheen Lake Wwtp Lagoons to ensure the safety and sustainability of our water resources in Washington state.

Year Completed

2016

Dam Length

3169

Primary Dam Type

Earth

Surface Area

10.13

Hydraulic Height

13

Drainage Area

0.02

Nid Storage

120.6

Structural Height

15

Hazard Potential

High

Nid Height

15
       
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.