Cooper Reservoir Report
Nearby: Cooper #16 Cooper #20
Last Updated: December 21, 2025
Cooper is a private earth dam located in Harper, Oklahoma, along the Sand Creek.
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Summary
Designed by the USDA NRCS, this structure stands at 25 feet in height with a storage capacity of 70 acre-feet. While primarily serving no specified purpose, Cooper's low hazard potential and moderate risk assessment suggest a level of safety and stability.
Managed by the Natural Resources Conservation Service, Cooper has not been rated for its condition but is deemed to meet guidelines for emergency action plans. Despite its uncontrolled spillway type, this dam has not undergone recent inspections and lacks updated inundation maps. With a risk assessment indicating a moderate level of risk, Cooper stands as a testament to the importance of ongoing monitoring and maintenance for water resource infrastructure.
Situated in the Tulsa District with a Republican congressman representing the area, Cooper represents a vital piece of water resource infrastructure in Oklahoma. With its location in a region susceptible to climate variability, continued attention to monitoring and risk management will be essential for ensuring the safety and longevity of this private dam.
Dam Height |
25 |
River Or Stream |
SAND CREEK |
Hydraulic Height |
25 |
Nid Storage |
70 |
Hazard Potential |
Low |
Nid Height |
25 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Cimarron River Near Buffalo
|
75cfs |
North Canadian River At Woodward
|
59cfs |
Cimarron R Near Buttermilk
|
43cfs |
Bluff Creek Nr Buttermilk
|
43cfs |
Cimarron River Near Waynoka
|
133cfs |
Crooked C Nr Englewood
|
7cfs |
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