Evans Tieton Pond Dam Reservoir Report
Nearby: French Canyon Evans Far West Pond Dam
Last Updated: December 15, 2025
Evans Tieton Pond Dam, located in Tieton, Washington, is a privately owned earth dam primarily used for irrigation purposes.
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Summary
Completed in 2004 by PLSA Engineers, this dam stands at a structural height of 35 feet and has a hydraulic height of 33 feet. It has a storage capacity of 38 acre-feet, with a normal storage level of 27 acre-feet, covering a surface area of 2.1 acres and serving a drainage area of 0.43 square miles.
Situated on an unnamed tributary of Cowiche Creek, Evans Tieton Pond Dam is regulated by the Washington Department of Ecology and undergoes state inspection and enforcement. With a high hazard potential but a satisfactory condition assessment, the dam has a history of regular inspections every five years, with the last one conducted in October 2019. Despite being a private structure, the dam plays a crucial role in supporting irrigation activities in the surrounding area and contributes to water resource management in Yakima County.
In the event of an emergency, the dam has an Emergency Action Plan (EAP) that was last revised in November 2019. While it meets guidelines, further risk assessments and management measures may be needed to ensure the safety and integrity of Evans Tieton Pond Dam for both water resource and climate enthusiasts who value sustainable water management practices.
Year Completed |
2004 |
Dam Length |
250 |
River Or Stream |
Unnamed Trib Cowiche Creek |
Primary Dam Type |
Earth |
Surface Area |
2.1 |
Hydraulic Height |
33 |
Drainage Area |
0.43 |
Nid Storage |
38 |
Structural Height |
35 |
Hazard Potential |
High |
Foundations |
Soil |
Nid Height |
35 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Ahtanum Creek At Union Gap
|
197cfs |
Yakima River Above Ahtanum Creek At Union Gap
|
14200cfs |
Yakima River At Umtanum
|
6380cfs |
Toppenish Creek Near Fort Simcoe
|
57cfs |
American River Near Nile
|
809cfs |
Klickitat River Above West Fork Near Glenwood
|
830cfs |
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 Tieton Pond Dam