Port Of Sunnyside Anaerobic Pretreatment System Reservoir Report
Last Updated: December 15, 2025
The Port of Sunnyside Anaerobic Pretreatment System in Yakima, Washington, is a cutting-edge water resource facility designed to efficiently treat wastewater and reduce environmental impact.
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Summary
Owned by the local government and regulated by the Washington Department of Ecology, this state-of-the-art system features an anaerobic pretreatment process that helps to improve water quality before discharge. Completed in 2015, this facility operates with high hazard potential but has been assessed as satisfactory in terms of condition.
With a capacity of 36 million gallons and a normal storage level of 31 million gallons, the Port of Sunnyside Anaerobic Pretreatment System plays a crucial role in managing water resources in the region. Its unique design, including an earth dam with stone core and soil foundation, underscores its commitment to sustainability and efficiency. This facility stands as a testament to the importance of innovative water treatment solutions in combating climate change and protecting our precious water resources for future generations.
Year Completed |
2015 |
Dam Length |
1400 |
Primary Dam Type |
Earth |
Surface Area |
2.45 |
Hydraulic Height |
22 |
Nid Storage |
36 |
Structural Height |
22 |
Hazard Potential |
High |
Foundations |
Soil |
Nid Height |
22 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Yakima River At Mabton
|
19900cfs |
Granger Drain At Granger
|
13cfs |
Columbia River Below Priest Rapids Dam
|
115000cfs |
Yakima River At Kiona
|
16300cfs |
Yakima River Above Ahtanum Creek At Union Gap
|
11300cfs |
Ahtanum Creek At Union Gap
|
164cfs |
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.
Port Of Sunnyside Anaerobic Pretreatment System