Cob Creek Dam Reservoir Report
Nearby: Chapman Upper Star Mountain Reservoir
Last Updated: December 13, 2025
Cob Creek Dam, located in Juntura, Oregon, is a privately owned structure used primarily for irrigation purposes.
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Summary
Completed in 1962, this earth dam stands at a height of 29 feet, with a hydraulic height of 27 feet and a structural height of 31 feet. It spans a length of 1000 feet and has a storage capacity of 128 acre-feet, serving the surrounding area with a normal storage of 128 acre-feet.
Situated on Visher & Cob Creeks, tributaries of the South Fork Malheur River, Cob Creek Dam plays a crucial role in managing water resources in the region. With a low hazard potential and a moderate risk assessment, the dam provides a reliable supply of water for irrigation while maintaining a safe operational status. The dam is regulated, inspected, and enforced by the Oregon Water Resources Department, ensuring its compliance with state regulations.
Despite being uncontrolled, Cob Creek Dam has a spillway width of 0 and utilizes slide (sluice gate) outlet gates for water release. The dam's condition is currently rated as "Not Rated", with the last inspection conducted in October 2014. With its important role in water management and irrigation in the area, Cob Creek Dam stands as a key infrastructure for sustainable water resource utilization in Malheur County, Oregon.
Year Completed |
1962 |
Dam Length |
1000 |
Dam Height |
29 |
River Or Stream |
VISHER & COB CREEKS, TRIB SOUTH FORK MALHEUR |
Primary Dam Type |
Earth |
Surface Area |
11.7 |
Hydraulic Height |
27 |
Drainage Area |
6.2 |
Nid Storage |
128 |
Structural Height |
31 |
Outlet Gates |
Slide (sluice gate) |
Hazard Potential |
Low |
Nid Height |
31 |
Seasonal Comparison
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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.
Cob Creek Dam