Scs-Little Washita River Site-27 Reservoir Report

Last Updated: December 6, 2025

SCS-Little Washita River Site-27, located in Caddo County, Oklahoma, is a state-regulated earth dam constructed in 1976 by the USDA NRCS with a primary purpose of flood risk reduction along the TR-Little Washita River.


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Summary

This dam stands at a height of 55 feet and has a hydraulic height of 50 feet, with a length of 1080 feet. The dam has a maximum storage capacity of 921 acre-feet and a normal storage capacity of 253 acre-feet, serving as a crucial infrastructure for managing water resources in the region.

Despite being categorized as low hazard potential, the risk assessment for SCS-Little Washita River Site-27 indicates a very high risk level, with a DSAC assignment date and a lack of risk management measures. The dam is equipped with a controlled spillway, one valve outlet gate, and is under the jurisdiction of the OWRB for state regulation, inspection, and enforcement. The site has not been rated for its condition assessment, and the last inspection was conducted in August 2004 with a recommended inspection frequency of 5 years.

Overall, SCS-Little Washita River Site-27 plays a vital role in flood risk reduction and water management in the region, despite facing a very high risk level according to the assessment. With its strategic location along the Little Washita River and the involvement of the USDA NRCS in its design, this earth dam serves as a key infrastructure for safeguarding the local community against potential floods and ensuring the sustainable use of water resources in Caddo County, Oklahoma.

Year Completed

1976

Dam Length

1080

Dam Height

55

River Or Stream

TR-LITTLE WASHITA RIVER

Primary Dam Type

Earth

Surface Area

35

Hydraulic Height

50

Nid Storage

921

Structural Height

55

Outlet Gates

Valve - 1

Hazard Potential

Low

Foundations

Soil

Nid Height

55
       
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.