Oak Harbor Wastewater Lagoon Sw Cell Reservoir Report

Last Updated: December 15, 2025

The Oak Harbor Wastewater Lagoon SW Cell is a crucial water resource infrastructure managed by the local government in Island, Washington.


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Summary

This facility, completed in 1990, serves the primary purpose of wastewater management and has a storage capacity of 60 acre-feet. Located in a strategic position along the Tr-Crescent Harbor-Offstream water body, this lagoon plays a significant role in maintaining water quality and environmental health in the region.

With a low hazard potential and a structural height of 8 feet, the Oak Harbor Wastewater Lagoon SW Cell has been regulated and permitted by the Washington Department of Ecology. This earth dam structure, built with a rockfill core and soil foundation, covers a surface area of 8.2 acres and serves as a vital component of the local water management system. Despite not being rated for condition assessment, this facility operates with a normal storage capacity of 50 acre-feet and has a maximum discharge capacity of 1 cubic foot per second.

Climate and water resource enthusiasts can appreciate the importance of the Oak Harbor Wastewater Lagoon SW Cell in maintaining ecological balance and wastewater treatment efficiency in the region. With its strategic location, low hazard potential, and regulatory oversight, this infrastructure exemplifies responsible water resource management practices and contributes to the overall sustainability of the local environment.

Year Completed

1990

Dam Length

2550

River Or Stream

Tr-Crescent Harbor-Offstream

Primary Dam Type

Earth

Surface Area

8.2

Hydraulic Height

8

Drainage Area

0.01

Nid Storage

60

Structural Height

8

Hazard Potential

Low

Foundations

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.