South Branch 27 Reservoir Report
Last Updated: December 6, 2025
South Branch 27 is a local government-owned earth dam located in Brock, Nebraska, along the TR-S FK Little Nemaha River.
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Summary
Built in 1994 by the USDA NRCS, this dam serves the primary purpose of flood risk reduction and stands at a height of 30 feet with a length of 1055 feet. With a maximum storage capacity of 1094 acre-feet and a normal storage of 163 acre-feet, the dam covers a surface area of 36 acres and has a drainage area of 3.7 square miles.
Managed by the Nebraska Department of Natural Resources, South Branch 27 is regulated, inspected, and enforced by the state agencies to ensure its structural integrity and compliance with safety standards. The dam has a satisfactory condition assessment as of June 2016 and a low hazard potential. Despite its low hazard potential, the dam undergoes inspections every 5 years to ensure its continued safety and effectiveness in flood risk reduction. With its strategic location and design, South Branch 27 plays a crucial role in protecting the surrounding community from potential flooding events in the area.
Year Completed |
1994 |
Dam Length |
1055 |
Dam Height |
30 |
River Or Stream |
TR-S FK LITTLE NEMAHA RIVER |
Primary Dam Type |
Earth |
Surface Area |
36 |
Hydraulic Height |
30 |
Drainage Area |
3.7 |
Nid Storage |
1094 |
Structural Height |
37 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
37 |
Seasonal Comparison
Weather Forecast
Dam Data Reference
Condition Assessment
SatisfactoryNo 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
HighDams 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.
South Branch 27