Scs-Big Wewoka Creek Site-21 Reservoir Report
Last Updated: December 8, 2025
SCS-Big Wewoka Creek Site-21, located in Seminole, Oklahoma, is a state-regulated earth dam designed by the USDA NRCS in 1963 for flood risk reduction along the TR-WEWOKA CR.
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Summary
With a structural height of 29 feet and a length of 1275 feet, this dam has a storage capacity of 681 acre-feet and a spillway width of 1 foot. Despite being in fair condition, the dam has a significant hazard potential and a very high risk assessment rating, making it crucial for regular inspections and maintenance.
Managed by the Oklahoma Water Resources Board, SCS-Big Wewoka Creek Site-21 serves as an essential structure for flood control in the region, with a normal storage capacity of 183 acre-feet and a maximum discharge rate of 1860 cubic feet per second. The dam's valve outlet and controlled spillway ensure efficient water management during heavy rainfall events. While no recent modifications or emergency action plans have been reported, the dam's condition assessment and risk management measures need to be regularly updated to ensure the safety of nearby communities and infrastructure.
In the event of a breach or failure, the dam poses a significant risk to downstream areas, warranting a thorough risk assessment and the development of updated emergency response procedures. With Congresswoman Kendra S. Horn representing the district, stakeholders and water resource enthusiasts are encouraged to stay informed about the maintenance and regulation of SCS-Big Wewoka Creek Site-21 to protect against potential flooding and ensure the long-term sustainability of the water resource infrastructure in the region.
Year Completed |
1963 |
Dam Length |
1275 |
Dam Height |
29 |
River Or Stream |
TR-WEWOKA CR |
Primary Dam Type |
Earth |
Surface Area |
34 |
Hydraulic Height |
29 |
Nid Storage |
681 |
Structural Height |
29 |
Outlet Gates |
Valve - 1 |
Hazard Potential |
Significant |
Foundations |
Soil |
Nid Height |
29 |
Seasonal Comparison
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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.
Scs-Big Wewoka Creek Site-21