Upper Little Nemaha 61 dam
Upper Little Nemaha 61
Upper Little Nemaha 61 is a vital Earth dam located in Unadilla, Nebraska, designed for flood risk reduction along the TR-Hooper Creek. Completed in 2001, this dam stands at a height of 39 feet, with a hydraulic height of 37 feet and a structural height of 44 feet, providing a storage capacity of 727 acre-feet to mitigate potential flooding in the area. With a low hazard potential and satisfactory condition assessment, this dam is regulated by the Nebraska Department of Natural Resources, ensuring regular inspections and enforcement to uphold its safety standards.
Owned and operated by the local government, Upper Little Nemaha 61 serves a primary purpose of flood risk reduction, with a normal storage capacity of 113 acre-feet and a maximum discharge of 907 cubic feet per second. With a drainage area of 2.6 square miles and a surface area of 23 acres, this dam plays a crucial role in managing water flow and protecting the surrounding community from potential flood events. Despite being a relatively new structure, this dam has already undergone several inspections, with the last assessment taking place in May 2018, indicating a commitment to maintaining its integrity and safety standards.
Situated in Congressional District 01, Nebraska, Upper Little Nemaha 61 is an essential piece of infrastructure in the region, overseen by the Kansas City District of the US Army Corps of Engineers. With its strategic location and effective design, this dam serves as a critical component in the overall water resource management and climate resilience efforts in Otoe County, Nebraska, highlighting the importance of sustainable infrastructure for safeguarding against natural disasters and preserving the environment for future generations.
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 Upper Little Nemaha 61 -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Stevens Creek Nr. Lincoln | 11 cfs | → |
| Salt Creek At Greenwood | 246 cfs | → |
| Salt Creek At 70th St. At Lincoln | 267 cfs | → |
| Salt Creek At Lincoln | 134 cfs | → |
| Salt Creek At Roca | 6 cfs | → |
| Little Salt Creek Near Lincoln | 6 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Upper Little Nemaha 61.
Track Upper Little Nemaha 61 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 Upper Little Nemaha 61
Where does the data for Upper Little Nemaha 61 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 Upper Little Nemaha 61.