Scs-Little Washita River Site-22 Reservoir Report

Last Updated: December 6, 2025

SCS-Little Washita River Site-22 is a state-regulated earth dam located in Cedar Grove, Oklahoma, along the TR-Little Washita River.


°F

°F

mph

Wind

%

Humidity

Summary

Designed by USDA NRCS and completed in 1977, this flood risk reduction structure stands at 45 feet high with a hydraulic height of 43 feet. It has a storage capacity of 204 acre-feet and a surface area of 9 acres, serving its primary purpose of flood risk reduction for the surrounding area.

Managed by the Oklahoma Water Resources Board, this dam features a controlled spillway and one valve outlet gate. Though it has a low hazard potential and has not been formally assessed for condition, the risk assessment for SCS-Little Washita River Site-22 indicates a very high risk level. Despite the lack of recent inspections or condition assessments, this dam remains a critical piece of infrastructure for managing water resources and protecting against flooding in the region.

As an important structure in the Tulsa District, SCS-Little Washita River Site-22 plays a vital role in water resource management and climate resilience efforts. With its strategic location along the Little Washita River, this earth dam serves as a key component in the overall flood risk reduction strategy for Comanche County, Oklahoma.

Year Completed

1977

Dam Length

920

Dam Height

45

River Or Stream

TR-LITTLE WASHITA RIVER

Primary Dam Type

Earth

Surface Area

9

Hydraulic Height

43

Nid Storage

204

Structural Height

45

Outlet Gates

Valve - 1

Hazard Potential

Low

Foundations

Soil

Nid Height

45
       
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.