Upper Little Nemaha 42 is an earth dam located in Otoe County, Nebraska, built in 2000. It carries a Low hazard potential classification and has a satisfactory condition assessment.
Dam profile
NID height · 45 ft45 ft tall and 1,170 ft long, taller than 90% of U.S. dams with a recorded height. Height is drawn to scale against a two-story house, about 25 ft; the profile is a generic embankment section and the water level is illustrative.
About Upper Little Nemaha 42
The primary purpose of Upper Little Nemaha 42 is flood risk reduction. The dam is designed to control downstream flooding by temporarily storing excess water during storms and releasing it at a controlled rate. The dam is owned by Nemaha Natural Resources District (local government). It impounds the Russell Creek near Unadilla.
The dam stands 45 feet tall and stretches 1,170 feet across, creates a reservoir covering 30 acres, has a maximum storage capacity of 941 acre-feet, and collects water from a drainage area of 3 square miles. Completed in 2000, the structure is 26 years old.
This dam has a low hazard potential classification, meaning that failure would cause minimal damage, limited primarily to the dam owner's property, with no expected loss of life. Its condition is rated satisfactory, indicating no existing or potential dam safety deficiencies are recognized. The most recent inspection on record was 06/01/2021.
At 45 feet, this dam is taller than 90% of dams nationwide.
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Location
| State | Nebraska |
| County | Otoe |
| Nearest City | Unadilla |
| River/Stream | Russell Creek |
| Coordinates | 40.64782, -96.35155 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 45 ft |
| Dam Height | 39 ft |
| Dam Length | 1,170 ft |
| Year Completed | 2000 (26 years old) |
Storage & Hydraulics
| NID Storage | 941 acre-ft |
| Max Storage | 941 acre-ft |
| Normal Storage | 146 acre-ft |
| Surface Area | 30 acres |
| Drainage Area | 3 sq mi |
| Max Discharge | 1,522 cfs |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | Nemaha Natural Resources District |
| Owner Type | Local Government |
| Hazard Classification | Low |
| Condition Assessment | Satisfactory |
| Last Inspection | 06/01/2021 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | NE02557 |
| Federal ID | NE02557 |
| More Info | State Dam Safety Program |