Scs-Little Washita River Site-21 Reservoir Report

Last Updated: December 6, 2025

SCS-Little Washita River Site-21, located in Cedar Grove, Comanche County, Oklahoma, is a state-regulated dam designed by the USDA NRCS with a primary purpose of flood risk reduction.


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Summary

Completed in 1970, this earth dam stands at a height of 33 feet and has a storage capacity of 206 acre-feet. The dam, situated on the TR-Little Washita River, features a controlled spillway and a single valve outlet gate.

Despite being classified as having a low hazard potential, SCS-Little Washita River Site-21 is deemed to have very high risk, possibly due to its age and lack of recent condition assessments. The dam has not been inspected since September 1985, with an inspection frequency of 5 years. While the dam's emergency action plan status is unknown, it is crucial to ensure that proper risk management measures are in place to mitigate any potential threats to downstream communities and the environment. For water resource and climate enthusiasts, monitoring and maintaining the integrity of SCS-Little Washita River Site-21 is essential to safeguarding against flood events and preserving the surrounding ecosystem.

Year Completed

1970

Dam Length

1400

Dam Height

33

River Or Stream

TR-LITTLE WASHITA RIVER

Primary Dam Type

Earth

Surface Area

6

Hydraulic Height

31

Nid Storage

206

Structural Height

33

Outlet Gates

Valve - 1

Hazard Potential

Low

Foundations

Soil

Nid Height

33
       
Seasonal Comparison

Weather Forecast

Dam Data Reference

Condition Assessment

Satisfactory
No 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

High
Dams 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.