Deweese No.17 Reservoir Report
Nearby: Deweese Gp-5 Smith #4
Last Updated: December 23, 2025
Deweese No.17 is a privately owned earth dam located in Harper, Oklahoma, near the city of Fort Supply.
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Summary
Built in 1959 by the USDA NRCS, this dam on TR-SAND CR stands at 34 feet tall with a hydraulic height of 30 feet and a length of 386 feet. It serves as a vital water resource structure with a storage capacity of 52 acre-feet and a maximum discharge of 904 cubic feet per second.
Managed by the Oklahoma Water Resources Board, Deweese No.17 is regulated, permitted, inspected, and enforced by state agencies to ensure its safety and functionality. The dam features a controlled spillway, a valve outlet gate, and a low hazard potential. Despite not being rated for its condition, the risk assessment for Deweese No.17 is classified as very high, indicating the need for effective risk management measures to mitigate potential hazards and ensure the dam's integrity.
For water resource and climate enthusiasts, Deweese No.17 represents a significant infrastructure designed to control water flow and provide essential storage for agricultural and environmental purposes in the region. With its historical significance and ongoing regulatory oversight, this earth dam serves as a critical component of Oklahoma's water management system, highlighting the importance of sustainable dam operations and risk reduction strategies in the face of changing climate conditions.
Year Completed |
1959 |
Dam Length |
386 |
Dam Height |
34 |
River Or Stream |
TR-SAND CR |
Primary Dam Type |
Earth |
Hydraulic Height |
30 |
Nid Storage |
52 |
Structural Height |
34 |
Outlet Gates |
Valve - 1 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
34 |
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.
Deweese No.17