Scs-Long Branch Creek Site-09 Reservoir Report

Last Updated: December 6, 2025

SCS-Long Branch Creek Site-09, located in Morrison, Oklahoma, is a state-regulated earth dam designed by USDA NRCS in 1976 for flood risk reduction along the TR-Long Branch Creek.


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Summary

This 24-foot tall structure with a hydraulic height of 20 feet and a length of 1080 feet serves as a critical component of water resource management in Payne County. The dam has a storage capacity of 250 acre-feet and a normal storage of 78 acre-feet, providing essential flood control measures for the area.

Managed by the OWRB and inspected by state regulatory agencies, SCS-Long Branch Creek Site-09 has a high hazard potential and a very high risk assessment rating. While the dam's condition assessment is currently not rated, its emergency action plan and risk management measures are under review. With a controlled spillway and a single valve outlet gate, the dam plays a crucial role in protecting the local community from potential flooding events.

For water resource and climate enthusiasts, SCS-Long Branch Creek Site-09 represents a significant engineering feat in flood risk reduction. With its strategic location and design features, this earth dam serves as a key infrastructure asset in safeguarding the watershed and ensuring the safety of residents in Payne County. As efforts continue to enhance its risk management measures and emergency preparedness, this site remains an essential component of water resource management in the region.

Year Completed

1976

Dam Length

1080

Dam Height

24

River Or Stream

TR-LONG BRANCH CREEK

Primary Dam Type

Earth

Surface Area

18

Hydraulic Height

20

Nid Storage

250

Structural Height

24

Outlet Gates

Valve - 1

Hazard Potential

High

Foundations

Soil

Nid Height

24
       
Seasonal Comparison

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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.