Deweese #10 Reservoir Report
Nearby: Deweese #13 Deweese Gp-12
Last Updated: December 21, 2025
Deweese #10 is a privately owned earth dam located in Harper County, Oklahoma, near the city of Fort Supply.
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Summary
Built in 1960 by the USDA NRCS, this dam spans a length of 157 feet and has a height of 37 feet, creating a reservoir with a storage capacity of 101 acre-feet. Situated on Sand Creek, the dam serves a primary purpose that is not specified, but its low hazard potential and moderate risk assessment rating indicate a relatively stable structure.
Although Deweese #10 is not regulated or inspected by the state, its design and construction by the Natural Resources Conservation Service ensure that it meets safety standards. The dam features an uncontrolled spillway with a width of 62 feet and has a surface area of 7 acres, serving the surrounding area with water storage and flood control benefits. With a risk management plan in place and a lack of significant modifications over the years, Deweese #10 remains a reliable water resource for the community and a testament to effective conservation efforts in the region.
Year Completed |
1960 |
Dam Length |
157 |
Dam Height |
37 |
River Or Stream |
SAND CREEK |
Primary Dam Type |
Earth |
Surface Area |
7 |
Hydraulic Height |
37 |
Drainage Area |
0.41 |
Nid Storage |
101 |
Hazard Potential |
Low |
Nid Height |
37 |
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 |
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.
Deweese #10