Middle Big Nemaha 88 Reservoir Report
Last Updated: December 6, 2025
Middle Big Nemaha 88, located in Johnson, Nebraska, is a vital part of flood risk reduction efforts in the area.
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Summary
Built in 2001 by the USDA NRCS, this earth dam stands at a height of 46 feet and has a maximum storage capacity of 2643 acre-feet. With a normal storage capacity of 257 acre-feet and a drainage area of 6.5 square miles, it plays a crucial role in managing water flow and minimizing flood risks along Laflins Branch.
The dam's structural height of 56 feet and satisfactory condition assessment make it a reliable asset for the community. Its significant hazard potential is mitigated by regular inspections, with the last one conducted in April 2018. The dam's location in Crab Orchard, its association with the Nebraska DNR, and its adherence to state regulations further underscore its importance in safeguarding the surrounding area from potential flooding events. Middle Big Nemaha 88 exemplifies effective water resource management and climate resilience efforts in Nebraska.
With its stone core and soil foundation, Middle Big Nemaha 88 is a testament to sound engineering and design principles. Its storage capacity, surface area, and maximum discharge rate of 6674 cubic feet per second demonstrate its capability to handle significant amounts of water during peak flow periods. As a local government-owned structure, Middle Big Nemaha 88 serves as a key component in the overall flood risk reduction strategy for the region, showcasing the collaborative efforts between federal and state agencies in safeguarding communities against natural disasters.
Year Completed |
2001 |
Dam Length |
1360 |
Dam Height |
46 |
River Or Stream |
LAFLINS BRANCH |
Primary Dam Type |
Earth |
Surface Area |
36 |
Hydraulic Height |
45 |
Drainage Area |
6.5 |
Nid Storage |
2643 |
Structural Height |
56 |
Hazard Potential |
Significant |
Foundations |
Soil |
Nid Height |
56 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Big Blue R At Barneston Nebr
|
131cfs |
Turkey Creek Near De Witt
|
10cfs |
Salt Creek At Roca
|
5cfs |
North Fork Big Nemaha River At Humboldt
|
67cfs |
Turkey C Nr Seneca
|
15cfs |
Little Nemaha River At Auburn
|
82cfs |
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 88