Wewoka Reservoir Report
Last Updated: December 8, 2025
Wewoka, located in Seminole County, Oklahoma, is home to a vital water supply dam situated on Coon Creek.
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Summary
Built in 1925, this earth dam stands at a height of 38 feet and has a storage capacity of 9,070 acre-feet, serving as a crucial source of water for the local community. Despite its importance, recent inspections have revealed a poor condition assessment, indicating a high hazard potential and a very high risk level.
Managed by the Oklahoma Water Resources Board, the Wewoka dam features a controlled spillway and three slide gates for water release. With a drainage area of 16.3 square miles and a maximum discharge capacity of 35,000 cubic feet per second, this dam plays a crucial role in flood control and water management in the region. However, the aging infrastructure and poor condition pose significant challenges for the continued operation and safety of this essential water resource.
As climate change impacts water resources and infrastructure resilience, the Wewoka dam serves as a poignant reminder of the importance of maintaining and upgrading aging infrastructure to adapt to changing environmental conditions. With a high hazard potential and very high risk assessment, the Wewoka dam requires urgent attention and investment to ensure the safety and security of the local community's water supply for years to come.
Year Completed |
1925 |
Dam Length |
1050 |
Dam Height |
38 |
River Or Stream |
COON CREEK |
Primary Dam Type |
Earth |
Surface Area |
371 |
Hydraulic Height |
38 |
Drainage Area |
16.3 |
Nid Storage |
9070 |
Structural Height |
38 |
Outlet Gates |
Slide (sluice gate) - 3 |
Hazard Potential |
High |
Foundations |
Rock, Soil |
Nid Height |
38 |
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.
Wewoka