Upper Little Nemaha 18
Upper Little Nemaha 18 is an earth dam located in Otoe County, Nebraska, built in 1996. It carries a Low hazard potential classification and has a satisfactory condition assessment.
About Upper Little Nemaha 18
The primary purpose of Upper Little Nemaha 18 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 Hooper Creek near Unadilla.
The dam stands 49 feet tall and stretches 1,185 feet across, creates a reservoir covering 35 acres, has a maximum storage capacity of 1,735 acre-feet, and collects water from a drainage area of 6 square miles. Completed in 1996, the structure is 30 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 06/21/2021.
At 49 feet, this dam is taller than 92% of dams nationwide.
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Location
| State | Nebraska |
| County | Otoe |
| Nearest City | Unadilla |
| River/Stream | Hooper Creek |
| Coordinates | 40.74628, -96.44930 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 49 ft |
| Dam Height | 38 ft |
| Dam Length | 1,185 ft |
| Year Completed | 1996 (30 years old) |
Storage & Hydraulics
| NID Storage | 1,735 acre-ft |
| Max Storage | 1,735 acre-ft |
| Normal Storage | 200 acre-ft |
| Surface Area | 35 acres |
| Drainage Area | 6 sq mi |
| Max Discharge | 3,798 cfs |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | Nemaha Natural Resources District |
| Owner Type | Local Government |
| Hazard Classification | Low |
| Condition Assessment | Satisfactory |
| Last Inspection | 06/21/2021 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | NE02439 |
| Federal ID | NE02439 |
| More Info | State Dam Safety Program |