South Branch 84 Reservoir Report

Last Updated: December 5, 2025

South Branch 84 is a flood risk reduction structure located in Nebraska, specifically in Otoe County.


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Summary

Managed by the USDA NRCS and regulated by the NE DNR, this earth dam stands at 38 feet high and was completed in 1987. With a primary purpose of flood risk reduction, South Branch 84 has a storage capacity of 244 acre-feet and serves to protect the surrounding area from potential flooding events.

Measuring 910 feet in length, South Branch 84 has a satisfactory condition assessment and a low hazard potential. Despite its low risk, the dam undergoes inspections every 5 years to ensure its structural integrity and functionality. With a drainage area of 1 square mile and a maximum discharge of 278 cubic feet per second, this structure plays a critical role in managing water resources in the region and mitigating flood risks along the TR-S FK Little Nemaha River.

South Branch 84's location in Douglas, Nebraska, highlights its importance in the local community's water resource management efforts. With its effective flood risk reduction capabilities and satisfactory condition, this earth dam stands as a significant infrastructure asset for climate and water resource enthusiasts in the area.

Year Completed

1987

Dam Length

910

Dam Height

38

River Or Stream

TR-S FK LITTLE NEMAHA RIVER

Primary Dam Type

Earth

Surface Area

9

Hydraulic Height

37

Drainage Area

1

Nid Storage

244

Structural Height

42

Hazard Potential

Low

Foundations

Soil

Nid Height

42
       
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.