Campbell Reservoir Report
Last Updated: December 13, 2025
Campbell, John Reservoir, also known as John M.
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Summary
Campbell Dam, is a privately-owned reservoir located in Harney, Oregon. Built in 1965, this earth dam serves primarily for irrigation purposes, with a storage capacity of 310 acre-feet. Situated on the Silvies River tributary, this reservoir covers an area of 83.5 acres and has a maximum discharge capacity of 600 cubic feet per second.
With a dam height of 23 feet and a hydraulic height of 19 feet, Campbell, John Reservoir is classified as having a low hazard potential, with a condition assessment of "Not Rated." The reservoir is equipped with needle outlet gates and has undergone inspections regularly, with the last inspection conducted in March 2015. Despite its low hazard potential, the reservoir is regulated and permitted by the Oregon Water Resources Department, ensuring its safe operation and compliance with state regulations.
Located in a remote area with no downstream settlement, Campbell, John Reservoir provides essential water resources for agricultural irrigation in the region. Its serene surroundings and strategic location make it a vital asset for water management and climate resilience efforts in Oregon. As water resource and climate enthusiasts, the conservation and sustainable use of this reservoir play a crucial role in ensuring the long-term availability and quality of water for both human and environmental needs.
Year Completed |
1965 |
Dam Length |
1320 |
Dam Height |
23 |
River Or Stream |
SILVIES RIVER, TRIB TO |
Primary Dam Type |
Earth |
Surface Area |
83.5 |
Hydraulic Height |
19 |
Drainage Area |
3.5 |
Nid Storage |
310 |
Structural Height |
25 |
Outlet Gates |
Needle |
Hazard Potential |
Low |
Nid Height |
25 |
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.
Campbell, John Reservoir