Upper Big Nemaha J-32 Reservoir Report
Last Updated: December 6, 2025
Upper Big Nemaha J-32 is a crucial earth dam located in Tecumseh, Nebraska, designed by the USDA NRCS and completed in 1978.
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Summary
This dam, with a height of 33 feet and a length of 507 feet, serves multiple purposes including flood risk reduction. It is regulated by the Nebraska Department of Natural Resources and is inspected regularly to ensure its structural integrity and safety.
Despite its low hazard potential, Upper Big Nemaha J-32 is currently assessed as being in poor condition as of May 2017. With a normal storage capacity of 12 acre-feet and a drainage area of 0.2 square miles, this dam plays a vital role in managing water resources in the region. Its location on the TR-Hooker Creek and association with the Omaha District highlight its importance in safeguarding the surrounding communities from potential flooding events.
Water resource and climate enthusiasts will appreciate the significance of Upper Big Nemaha J-32 in mitigating flood risks and managing water flow in Johnson County, Nebraska. Its structure, design, and regulatory oversight by the NE DNR underscore the importance of maintaining and monitoring dams to ensure their functionality and safety for the local residents and environment.
Year Completed |
1978 |
Dam Length |
507 |
Dam Height |
33 |
River Or Stream |
TR-HOOKER CREEK |
Primary Dam Type |
Earth |
Surface Area |
2 |
Hydraulic Height |
29 |
Drainage Area |
0.2 |
Nid Storage |
34 |
Structural Height |
37 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
37 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
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 Big Nemaha J-32