Upper Little Nemaha 61 Reservoir Report
Nearby: Upper Little Nemaha 8 Weyers Dam
Last Updated: December 5, 2025
Upper Little Nemaha 61 is a vital Earth dam located in Unadilla, Nebraska, designed for flood risk reduction along the TR-Hooper Creek.
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Summary
Completed in 2001, this dam stands at a height of 39 feet, with a hydraulic height of 37 feet and a structural height of 44 feet, providing a storage capacity of 727 acre-feet to mitigate potential flooding in the area. With a low hazard potential and satisfactory condition assessment, this dam is regulated by the Nebraska Department of Natural Resources, ensuring regular inspections and enforcement to uphold its safety standards.
Owned and operated by the local government, Upper Little Nemaha 61 serves a primary purpose of flood risk reduction, with a normal storage capacity of 113 acre-feet and a maximum discharge of 907 cubic feet per second. With a drainage area of 2.6 square miles and a surface area of 23 acres, this dam plays a crucial role in managing water flow and protecting the surrounding community from potential flood events. Despite being a relatively new structure, this dam has already undergone several inspections, with the last assessment taking place in May 2018, indicating a commitment to maintaining its integrity and safety standards.
Situated in Congressional District 01, Nebraska, Upper Little Nemaha 61 is an essential piece of infrastructure in the region, overseen by the Kansas City District of the US Army Corps of Engineers. With its strategic location and effective design, this dam serves as a critical component in the overall water resource management and climate resilience efforts in Otoe County, Nebraska, highlighting the importance of sustainable infrastructure for safeguarding against natural disasters and preserving the environment for future generations.
Year Completed |
2001 |
Dam Length |
1460 |
Dam Height |
39 |
River Or Stream |
TR-HOOPER CREEK |
Primary Dam Type |
Earth |
Surface Area |
23 |
Hydraulic Height |
37 |
Drainage Area |
2.6 |
Nid Storage |
727 |
Structural Height |
44 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
44 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Stevens Creek Nr. Lincoln
|
3cfs |
Salt Creek At Greenwood
|
125cfs |
Salt Creek At 70th St. At Lincoln
|
92cfs |
Salt Creek At Lincoln
|
77cfs |
Salt Creek At Roca
|
5cfs |
Little Salt Creek Near Lincoln
|
3cfs |
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.
Upper Little Nemaha 61