Middle Big Nemaha 46 Reservoir Report
Nearby: Meisinger Dam 3 Klaus Hartmann Dam
Last Updated: December 6, 2025
Middle Big Nemaha 46, located in Tecumseh, Nebraska, is a vital structure designed by USDA NRCS to reduce flood risk along the Lost BR Tr-Yankee Creek.
°F
°F
mph
Wind
%
Humidity
Summary
Completed in 1995, this earth dam stands at a height of 48 feet and has a normal storage capacity of 292 acre-feet, with a maximum storage of 3152 acre-feet. Its primary purpose is flood risk reduction, serving as a crucial defense mechanism for the surrounding area.
With a low hazard potential and a satisfactory condition assessment as of June 2016, Middle Big Nemaha 46 is a reliable structure that has been diligently maintained over the years. The dam boasts a structural height of 59 feet and a length of 1122 feet, showcasing its robust design and construction. The dam's location within the Omaha District and its regulatory oversight by the NE DNR highlight the collaborative efforts in place to ensure its continued effectiveness in protecting the community.
As a key component in the water resource management infrastructure of Johnson County, Nebraska, Middle Big Nemaha 46 plays a crucial role in safeguarding the local ecosystem and residents from the impacts of flooding. With its strategic positioning and solid foundation, this earth dam stands as a testament to effective engineering and proactive risk reduction measures in the face of climate variability and extreme weather events.
Year Completed |
1995 |
Dam Length |
1122 |
Dam Height |
48 |
River Or Stream |
LOST BR TR-YANKEE CREEK |
Primary Dam Type |
Earth |
Surface Area |
52 |
Hydraulic Height |
47 |
Drainage Area |
9.6 |
Nid Storage |
3152 |
Structural Height |
59 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
59 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Big Blue R At Barneston Nebr
|
131cfs |
North Fork Big Nemaha River At Humboldt
|
67cfs |
Turkey Creek Near De Witt
|
10cfs |
Salt Creek At Roca
|
5cfs |
Little Nemaha River At Auburn
|
82cfs |
Turkey C Nr Seneca
|
15cfs |
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.
Middle Big Nemaha 46