Scs-Little Washita River Site-04 Reservoir Report
Nearby: Oknoname 051057 Oknoname 051054
Last Updated: December 6, 2025
SCS-Little Washita River Site-04 is a state-regulated water resource located in Ninnekah, Grady County, Oklahoma.
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Summary
Designed by the USDA NRCS, this flood risk reduction structure on Rock Creek was completed in 1976 and serves a primary purpose of flood risk reduction. The dam stands at a height of 33 feet and has a storage capacity of 250 acre-feet, with a normal storage level of 68 acre-feet. Despite being classified as having low hazard potential, the risk assessment for this site ranks it as very high, highlighting the importance of proper management and monitoring.
Owned and regulated by the state, with oversight from the OWRB, this site has undergone inspections and enforcement for its operational integrity. The dam features a stone core and soil foundation, with a controlled spillway type and a single valve outlet gate. With a drainage area of 1.29 square miles and a maximum discharge capacity of 817 cubic feet per second, this structure plays a crucial role in managing water flow and mitigating flood risks in the area. Despite its last inspection date being in 1980, the site's condition assessment is currently not rated, indicating a need for updated evaluations and maintenance protocols to ensure its continued effectiveness in flood control.
Located in a region represented by Tom Cole in Oklahoma's 4th Congressional District, this site is part of the Tulsa District managed by the Natural Resources Conservation Service. With a history of state permitting and inspection, as well as a designated emergency action plan, SCS-Little Washita River Site-04 represents a vital component of the local water resource infrastructure. Its strategic design and operational features contribute to the overall resilience of the area against flooding events, underscoring the significance of sustainable water management practices in the face of climate challenges.
Year Completed |
1976 |
Dam Length |
750 |
Dam Height |
33 |
River Or Stream |
ROCK CREEK |
Surface Area |
11 |
Hydraulic Height |
30 |
Drainage Area |
1.29 |
Nid Storage |
250 |
Structural Height |
33 |
Outlet Gates |
Valve - 1 |
Hazard Potential |
Low |
Foundations |
Soil |
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.
Scs-Little Washita River Site-04