Cooper #23 Reservoir Report
Nearby: Cooper Gp #6 Cooper Gp #8
Last Updated: December 21, 2025
Cooper #23, located in Harper County, Oklahoma, is a private earth dam built in 1960 by the USDA NRCS.
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Summary
Standing at a height of 26 feet and stretching 140 feet in length, this dam has a storage capacity of 18 acre-feet and serves a drainage area of 0.19 square miles. Despite its uncontrolled spillway type and low hazard potential, the dam has a moderate risk assessment rating of 3.
Managed by the Natural Resources Conservation Service, Cooper #23 has not been rated for its condition assessment and lacks emergency action plans or inundation maps. With no state regulation or inspection, the dam's risk management measures and risk characteristics remain unspecified. However, the surrounding area of Fort Supply, Oklahoma, can benefit from the water storage capabilities and flood control provided by this structure.
For water resource and climate enthusiasts, Cooper #23 presents an interesting case study of a privately owned dam in a rural area. With a history of construction by federal agencies and a moderate risk assessment, this dam serves as a reminder of the importance of proper maintenance and emergency preparedness in safeguarding water resources and surrounding communities from potential hazards.
Year Completed |
1960 |
Dam Length |
140 |
Dam Height |
26 |
Surface Area |
2 |
Hydraulic Height |
26 |
Drainage Area |
0.19 |
Nid Storage |
18 |
Hazard Potential |
Low |
Nid Height |
26 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
North Canadian River At Woodward
|
59cfs |
Cimarron River Near Buffalo
|
75cfs |
Cimarron R Near Buttermilk
|
43cfs |
Bluff Creek Nr Buttermilk
|
43cfs |
Cimarron River Near Waynoka
|
133cfs |
North Canadian River Near Seiling
|
101cfs |
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.
Cooper #23