Sheep Springs Dam Reservoir Report
Last Updated: December 13, 2025
Sheep Springs Dam, located in Hooper, Washington, has been serving the community since its completion in 1906.
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Summary
This private-owned gravity dam on Cow Creek was primarily built for irrigation purposes, with a storage capacity of 150 acre-feet. The dam stands at a height of 30 feet and has a length of 94 feet, providing water resources for agriculture in the region.
Managed by the Washington Department of Ecology, Sheep Springs Dam is regulated and inspected regularly to ensure its safety and functionality. With a low hazard potential and a condition assessment of "Not Rated," the dam continues to play a crucial role in water management and conservation efforts in Adams County.
While the dam's primary purpose is irrigation, it also offers recreational opportunities and covers a surface area of 7 acres. With its historical significance and contribution to the local water supply, Sheep Springs Dam stands as a testament to sustainable water resource management in the region.
Year Completed |
1906 |
Dam Length |
94 |
River Or Stream |
Cow Creek |
Primary Dam Type |
Gravity |
Surface Area |
7 |
Hydraulic Height |
30 |
Drainage Area |
342 |
Nid Storage |
150 |
Structural Height |
30 |
Hazard Potential |
Low |
Foundations |
Rock |
Nid Height |
30 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Palouse River At Hooper
|
391cfs |
Coal Creek At Mohler
|
0cfs |
Crab Creek At Irby
|
2cfs |
Tucannon River Near Starbuck
|
215cfs |
Crab Creek Near Moses Lake
|
34cfs |
Wilson Creek Below Corbett Draw Near Almira
|
0cfs |
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.
Sheep Springs Dam