Waterville Sewage Treatment Pond Reservoir Report

Last Updated: December 15, 2025

The Waterville Sewage Treatment Pond in Douglas, Washington is a gravity dam that was completed in 1954 with a primary purpose of sewage treatment.


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Summary

This local government-owned facility is regulated by the Washington Dept of Ecology and is part of the Tr-Douglas Creek-Offstream watershed. With a storage capacity of 60 acre-feet and a surface area of 21 acres, this facility plays a crucial role in managing wastewater and protecting the local environment.

Situated in Congressional District 04, Washington, the Waterville Sewage Treatment Pond has a low hazard potential and has not been rated for its condition assessment. Despite not having a current Emergency Action Plan (EAP) or updated contact information, this facility meets state permitting, inspection, and enforcement requirements. With a maximum discharge rate of 8 cubic feet per second, this sewage treatment pond serves as a vital infrastructure for the community while ensuring compliance with state regulations and guidelines.

As a key component of the local wastewater management system, the Waterville Sewage Treatment Pond helps mitigate the impact of sewage on the surrounding environment. With a history dating back to the mid-20th century, this facility continues to play a crucial role in maintaining water quality and protecting public health in Douglas, Washington.

Year Completed

1954

Dam Length

1600

River Or Stream

Tr-Douglas Creek-Offstream

Primary Dam Type

Gravity

Surface Area

21

Hydraulic Height

8

Drainage Area

0.03

Nid Storage

60

Structural Height

7

Hazard Potential

Low

Foundations

Rock, Soil

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.