Evans Flavorland Reservoir No 1 Reservoir Report
Last Updated: December 15, 2025
Evans Flavorland Reservoir No 1, located in Sunnyside, Washington, is a privately-owned earth dam that was completed in 1985 for the primary purpose of irrigation.
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Summary
Managed by the Washington Department of Ecology, this reservoir has a capacity of 126 acre-feet and covers a surface area of 3.1 acres, serving the agricultural needs of the surrounding area. The dam stands at a hydraulic height of 40 feet, with a structural height of 40 feet, making it a crucial water resource for the local community.
With a drainage area of 0.59 square miles and a maximum discharge of 250 cubic feet per second, Evans Flavorland Reservoir No 1 plays a significant role in water management and conservation in Yakima County. Despite being classified as having a high hazard potential, the dam is currently in fair condition according to the last inspection in May 2018. The dam's emergency action plan was last revised in October 2019, ensuring that proper protocols are in place to address any potential risks or incidents that may arise.
Overall, Evans Flavorland Reservoir No 1 serves as a vital component of the water infrastructure in the region, supporting agricultural activities and water supply needs. With its strategic location along an unnamed tributary of the Yakima River, the reservoir plays a key role in irrigation and water storage, highlighting the importance of efficient water resource management in the face of changing climate conditions.
Year Completed |
1985 |
Dam Length |
420 |
River Or Stream |
Unnamed Trib Yakima River |
Primary Dam Type |
Earth |
Surface Area |
3.1 |
Hydraulic Height |
40 |
Drainage Area |
0.59 |
Nid Storage |
126 |
Structural Height |
40 |
Hazard Potential |
High |
Foundations |
Rock, Soil |
Nid Height |
40 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Granger Drain At Granger
|
13cfs |
Yakima River At Mabton
|
19900cfs |
Columbia River Below Priest Rapids Dam
|
115000cfs |
Yakima River Above Ahtanum Creek At Union Gap
|
11300cfs |
Ahtanum Creek At Union Gap
|
164cfs |
Yakima River At Kiona
|
16300cfs |
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.
Evans Flavorland Reservoir No 1