Smith #4 Reservoir Report
Nearby: Ruble Gp #5 Smith Gp6
Last Updated: December 23, 2025
Smith #4 is a privately owned earth dam located on Sand Creek in Harper County, Oklahoma.
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Summary
Built in 1959 by the USDA NRCS, this dam stands at 33 feet high and spans 277 feet in length, with a storage capacity of 217 acre-feet. Despite its low hazard potential and moderate risk assessment, the dam is currently not rated for its condition. It has a spillway width of 108 feet and is designated as uncontrolled, serving as a vital structure for water resource management in the area.
Managed by the Natural Resources Conservation Service, Smith #4 plays a crucial role in regulating water flow and storage for the surrounding area, with a drainage area of 3.51 square miles. Its location in Fort Supply, Oklahoma, not only aids in flood control but also provides essential water resources for agricultural and environmental purposes. With a surface area of 6 acres and a normal storage capacity of 48 acre-feet, this dam contributes significantly to the region's water supply and ecosystem health.
While Smith #4 has not undergone a recent inspection and lacks a condition assessment, its strategic position on Sand Creek and solid construction by the USDA NRCS ensure its continued functionality for water management. As climate change impacts water resources and availability, structures like Smith #4 become increasingly important in maintaining water security and resilience in the face of evolving environmental challenges.
Year Completed |
1959 |
Dam Length |
277 |
Dam Height |
33 |
River Or Stream |
SAND CREEK |
Primary Dam Type |
Earth |
Surface Area |
6 |
Hydraulic Height |
33 |
Drainage Area |
3.51 |
Nid Storage |
217 |
Hazard Potential |
Low |
Nid Height |
33 |
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.
Smith #4