Deweese Gp-5 Reservoir Report
Nearby: Deweese No.17 Smith #4
Last Updated: December 23, 2025
Deweese Gp-5 is a privately owned earth dam located in Harper, Oklahoma, along the Sand Creek.
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Summary
Constructed in 1959 by the USDA NRCS, this dam stands at a height of 32 feet and stretches 382 feet in length, with a storage capacity of 35 acre-feet. The spillway, which is uncontrolled, has a width of 46 feet, and the dam's hazard potential is rated as low with a moderate risk assessment.
Despite being a low hazard potential dam, Deweese Gp-5 has not been rated for its condition assessment and lacks emergency action preparedness measures. The dam's primary purpose and associated structures are not specified, and it is not regulated or inspected by the state. However, the dam serves as a vital water resource in the area, with a drainage area of 0.71 square miles and a surface area of 3 acres. Enthusiasts interested in water resources and climate in the region may find Deweese Gp-5's design and operational details intriguing for further study.
Year Completed |
1959 |
Dam Length |
382 |
Dam Height |
32 |
River Or Stream |
SAND CREEK |
Primary Dam Type |
Earth |
Surface Area |
3 |
Hydraulic Height |
32 |
Drainage Area |
0.71 |
Nid Storage |
35 |
Hazard Potential |
Low |
Nid Height |
32 |
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 Gp-5