Middle Big Nemaha 4 dam
Middle Big Nemaha 4
Middle Big Nemaha 4, located in Tecumseh, Nebraska, is a crucial flood risk reduction structure designed by USDA NRCS in 2003. This earth dam stands at a height of 47 feet and a hydraulic height of 46 feet, with a structural height of 56 feet. It serves the primary purpose of flood risk reduction along Beatty Creek, offering a storage capacity of 1305 acre-feet and a normal storage level of 103 acre-feet. With a drainage area of 4.4 square miles and a maximum discharge of 3225 cubic feet per second, this dam plays a vital role in mitigating flood risks in the region.
Owned by the local government, Middle Big Nemaha 4 is regulated by the Nebraska Department of Natural Resources, with state permitting, inspection, and enforcement in place. The dam's satisfactory condition assessment in 2016 and low hazard potential indicate its reliability in flood risk management. With a surface area of 15 acres and a dam length of 1398 feet, this structure provides essential protection to the surrounding area. As a key component of the flood control infrastructure in Johnson County, Nebraska, Middle Big Nemaha 4 highlights the importance of effective water resource management and climate resilience efforts.
In the event of emergencies, the dam's preparedness and risk management measures are critical for ensuring the safety of the community. While further details on emergency action plans and risk assessment are yet to be confirmed, Middle Big Nemaha 4's role in reducing flood risks and safeguarding the local environment underscores the significance of proactive water resource management practices. For water resource and climate enthusiasts, this structure serves as a testament to the ongoing efforts to enhance resilience and sustainability in the face of changing environmental conditions.
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.
- 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.
- 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.
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, environmental 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.
Plan around the weather
Same NOAA / yr.no feed Snoflo's iOS app uses. Watch the precipitation column on the meteogram -- rain on the basin upstream typically lifts inflow 24-72 hours later.
Next 5 days, hour by hour
Temperature line with weather symbols on top, snow + rain accumulation as columns, humidity as a dotted line.
5-day forecast table
Every 3 hours, broken out across temperature, snow, rain, humidity, and wind. Each cell is colour-coded relative to the column min/max.
| Time | Condition | Temp (°F) | Snow (in) | Rain (in) | Humidity (%) | Wind (mps) | Wind dir |
|---|---|---|---|---|---|---|---|
| Loading detailed forecast… | |||||||
15-day temperature & precipitation
Daily temperatures, snow, and rain projected over the next two weeks.
Nearby streamflow gauges
USGS streamgauges around Middle Big Nemaha 4 -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| North Fork Big Nemaha River At Humboldt | 850 cfs | → |
| Little Nemaha River At Auburn | 743 cfs | → |
| Salt Creek At Roca | 6 cfs | → |
| Big Blue R At Barneston Nebr | 2,280 cfs | → |
| Missouri River At Nebraska City | 37,500 cfs | → |
| Turkey Creek Near De Witt | 195 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Middle Big Nemaha 4.
Track Middle Big Nemaha 4 in the Snoflo app
Save this dam as a favorite and get the local NOAA / yr.no forecast plus regional flow context wherever you are.
About Middle Big Nemaha 4
Where does the data for Middle Big Nemaha 4 come from?
Structural and regulatory data come from the U.S. Army Corps of Engineers' National Inventory of Dams (NID). Weather forecast comes from NOAA / yr.no -- the same feed Snoflo's iOS app uses.
How often is the report updated?
NID structural data refreshes annually as the Corps publishes updated assessments. The weather forecast refreshes throughout the day.
What does the Low hazard rating mean?
The Corps of Engineers' hazard potential classification grades probable consequences if the dam fails: High = probable loss of human life; Significant = no probable loss of human life but possible economic loss / environmental damage; Low = no probable loss of human life, only minor economic / environmental losses. See the Dam Data Reference card above for the full definitions.
What's "% of normal"?
The current storage value compared to the historical average storage on this calendar day. 100% = right on average; values above 100% mean above-normal storage (wet year); values below mean below-normal (dry year or drought).
Can I get alerts when storage crosses a threshold?
Yes -- alerts are managed in the Snoflo iOS app. Favorite this dam, set a threshold, and you'll get a push the moment conditions cross.
Other water bodies near here
Snoflo-tracked reservoirs and dams within driving distance of Middle Big Nemaha 4.