Upper Little Nemaha 8 Reservoir Report

Last Updated: December 5, 2025

Upper Little Nemaha 8 is a vital flood risk reduction infrastructure located in UNADILLA, Otoe County, Nebraska.


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Summary

This earth dam, completed in 1996, stands at a height of 48 feet and has a storage capacity of 2075 acre-feet, serving the primary purpose of mitigating flood risks for the local community. Managed by the Nebraska Department of Natural Resources, this structure along TR-HOOPER CREEK is regulated, inspected, and enforced by state authorities to ensure its operational integrity.

With a low hazard potential and fair condition assessment as of September 2019, Upper Little Nemaha 8 plays a critical role in protecting the surrounding area from potential inundation risks. Its design features stone core and soil foundation, contributing to its structural stability and effectiveness in flood control. The dam's maximum discharge capacity of 3885 cubic feet per second further highlights its importance in managing water flow during extreme weather events. While lacking specific spillway information, the dam's location within Congressional District 01, Nebraska, underscores its significance in the region's water resource management.

This dam, part of the Kansas City District, serves as a key asset in the overall water infrastructure of Nebraska, showcasing the state's commitment to flood risk reduction and environmental protection. The regular inspection schedule and adherence to state regulatory standards demonstrate a proactive approach to ensuring the safety and functionality of Upper Little Nemaha 8. As climate change continues to impact water resources, structures like this play a crucial role in safeguarding communities and ecosystems from the escalating threats of extreme weather events and rising water levels.

Year Completed

1996

Dam Length

1205

Dam Height

37

River Or Stream

TR-HOOPER CREEK

Primary Dam Type

Earth

Surface Area

50

Hydraulic Height

37

Drainage Area

7

Nid Storage

2075

Structural Height

48

Hazard Potential

Low

Foundations

Soil

Nid Height

48
       
Seasonal Comparison

Weather Forecast

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Nearby Streamflow Levels

Upper Little Nemaha 8STEVENS CREEK NR. LINCOLN Preview Stevens Creek Nr. Lincoln
2.69cfs
3cfs
Upper Little Nemaha 8SALT CREEK AT GREENWOOD Preview Salt Creek At Greenwood
125.0cfs
125cfs
Upper Little Nemaha 8SALT CREEK AT 70th ST. AT LINCOLN Preview Salt Creek At 70th St. At Lincoln
91.8cfs
92cfs
Upper Little Nemaha 8SALT CREEK AT LINCOLN Preview Salt Creek At Lincoln
76.6cfs
77cfs
Upper Little Nemaha 8SALT CREEK AT ROCA Preview Salt Creek At Roca
4.93cfs
5cfs
Upper Little Nemaha 8SALT CREEK AT PIONEERS BLVD AT LINCOLN Preview Salt Creek At Pioneers Blvd At Lincoln
10.5cfs
11cfs

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.
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