South Branch 12 Reservoir Report
Nearby: South Branch 13 South Branch 45
Last Updated: December 6, 2025
South Branch 12 is a flood risk reduction structure located in Brock, Nebraska, along the TR-SAUNDERS CREEK.
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Summary
Built in 1994 by the USDA NRCS, this earth dam stands 29 feet tall and spans 917 feet in length. With a storage capacity of 296 acre-feet, it serves the primary purpose of mitigating flood risks in the area, particularly in Johnson County. The dam is regulated and inspected by the Nebraska Department of Natural Resources, ensuring its reliability in safeguarding the community from potential water-related hazards.
This low-hazard structure has been deemed to be in satisfactory condition as of the last inspection in 2016, with a regular inspection frequency of 5 years. The dam's spillway type, outlet gates, and associated structures are not specified, but its design and construction by the Natural Resources Conservation Service indicate a commitment to effective water resource management. Despite its modest surface area of 13 acres and drainage area of 0.9 square miles, South Branch 12 plays a crucial role in protecting the residents of Brock and surrounding areas from potential flooding events, showcasing the importance of sustainable infrastructure for climate resilience.
Year Completed |
1994 |
Dam Length |
917 |
Dam Height |
29 |
River Or Stream |
TR-SAUNDERS CREEK |
Primary Dam Type |
Earth |
Surface Area |
13 |
Hydraulic Height |
27 |
Drainage Area |
0.9 |
Nid Storage |
296 |
Structural Height |
39 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
39 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Salt Creek At Roca
|
5cfs |
Salt Creek At Pioneers Blvd At Lincoln
|
11cfs |
Stevens Creek Nr. Lincoln
|
3cfs |
Missouri River At Nebraska City
|
24100cfs |
Little Nemaha River At Auburn
|
82cfs |
Salt Creek At Lincoln
|
77cfs |
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 12