Deadman Creek Reservoir Reservoir Report
Nearby: Alder Creek Hunter Reservoir (Harney)
Last Updated: December 13, 2025
Deadman Creek Reservoir, located in Hamilton Ranch, Oregon, is a privately-owned water resource managed for irrigation purposes.
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Summary
The reservoir, completed in 1984, boasts a dam height of 55 feet and a storage capacity of 386 acre-feet. Situated on Deadman Creek, a tributary of the South Fork Malheur River, this Earth dam structure spans 400 feet in length, covering a surface area of 24.3 acres within a drainage area of 3.7 square miles.
Managed by the Oregon Water Resources Department, Deadman Creek Reservoir has a low hazard potential and is considered to have moderate risk, assessed at a level 3. With a spillway type classified as uncontrolled, the reservoir plays a vital role in the irrigation infrastructure of the region. Despite not being rated for condition assessment, the reservoir is inspected every six years to ensure operational safety and compliance with regulatory standards, showcasing a commitment to water resource management and climate resilience in the area.
Greg Walden (R) represents the area in the U.S. Congress, where the Walla Walla District oversees the reservoir's operations. The tranquil setting of Deadman Creek Reservoir, surrounded by the scenic landscape of Harney County, serves as a critical water source for agricultural activities in the region, highlighting the importance of sustainable water management practices for both local stakeholders and climate enthusiasts alike.
Year Completed |
1984 |
Dam Length |
400 |
Dam Height |
55 |
River Or Stream |
DEADMAN CREEK; TRIB SOUTH FORK MALHEUR |
Primary Dam Type |
Earth |
Surface Area |
24.3 |
Hydraulic Height |
45 |
Drainage Area |
3.7 |
Nid Storage |
386 |
Structural Height |
55 |
Hazard Potential |
Low |
Nid Height |
55 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
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.
Deadman Creek Reservoir