Upper Little Nemaha 42 Reservoir Report
Last Updated: December 5, 2025
Upper Little Nemaha 42 is a local government-owned dam located in UNADILLA, Nebraska, along the RUSSELL CREEK.
°F
°F
mph
Wind
%
Humidity
Summary
Constructed in 2000 for flood risk reduction, this earth dam stands at 39 feet high and has a storage capacity of 941 acre-feet, with a normal storage of 146 acre-feet. With a low hazard potential and satisfactory condition assessment as of May 2016, the dam is under the regulatory oversight of the Nebraska Department of Natural Resources.
The dam's primary purpose of flood risk reduction serves the surrounding Otoe County community by mitigating the impact of potential flooding events. Its earth core and stone foundation provide structural stability to handle a maximum discharge of 1522 CFS. The dam's location within Congressional District 01, Nebraska, under the oversight of Representative Jeff Fortenberry (R), highlights the importance of water resource management in the region.
Despite having no associated structures, Upper Little Nemaha 42 plays a vital role in protecting the area from potential flooding risks. With regular inspections and enforcement measures in place, the dam ensures the safety and well-being of the local community. Its presence contributes to the overall water resource management efforts in Nebraska, showcasing the importance of climate resilience and preparedness in the face of increasing environmental challenges.
Year Completed |
2000 |
Dam Length |
1170 |
Dam Height |
39 |
River Or Stream |
RUSSELL CREEK |
Primary Dam Type |
Earth |
Surface Area |
30 |
Hydraulic Height |
38 |
Drainage Area |
3.8 |
Nid Storage |
941 |
Structural Height |
45 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
45 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Salt Creek At Roca
|
5cfs |
Stevens Creek Nr. Lincoln
|
3cfs |
Salt Creek At Pioneers Blvd At Lincoln
|
11cfs |
Salt Creek At 70th St. At Lincoln
|
92cfs |
Salt Creek At Lincoln
|
77cfs |
Salt Creek At Greenwood
|
125cfs |
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 42