Wapanucka Reservoir Report
Last Updated: December 6, 2025
Wapanucka, located in Johnston, Oklahoma, is a locally owned earth dam primarily used for water supply purposes.
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Summary
Completed in 1950, this structure on Sandy Creek stands at a height of 20 feet and has a storage capacity of 165 acre-feet. Despite its low hazard potential, the dam is under the regulatory jurisdiction of the Oklahoma Water Resources Board, ensuring that it meets state inspection and enforcement standards.
The dam features a controlled spillway and a single valve outlet gate, with a maximum discharge capacity of 2046 cubic feet per second. While the condition assessment is currently not rated, the risk assessment for Wapanucka is deemed very high, indicating the need for vigilant risk management measures. The surrounding area is at risk of inundation, highlighting the importance of emergency preparedness and potentially updating the Emergency Action Plan to meet guidelines for the safety of the community.
Overall, Wapanucka serves as a vital water resource infrastructure in Oklahoma, providing essential water supply services while also posing some risks that require careful monitoring and management. With its strategic location and regulatory oversight by the OWRB, the dam remains a key component of the local water management system and a focal point for water resource and climate enthusiasts interested in understanding the intersection of infrastructure, risk assessment, and emergency preparedness in the face of changing climate conditions.
Year Completed |
1950 |
Dam Length |
225 |
Dam Height |
20 |
River Or Stream |
SANDY CR |
Primary Dam Type |
Earth |
Surface Area |
16 |
Hydraulic Height |
15 |
Nid Storage |
165 |
Structural Height |
20 |
Outlet Gates |
Valve - 1 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
20 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Blue River Near Connerville
|
54cfs |
Pennington Creek Near Reagan
|
7cfs |
Clear Boggy Creek Near Caney
|
423cfs |
Blue River Near Blue
|
58cfs |
Washita River Near Dickson
|
317cfs |
Rock Creek At Sulphur
|
8cfs |
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.
Wapanucka