Upper Little Nemaha 79
Upper Little Nemaha 79 is an earth dam located in Lancaster County, Nebraska, built in 1998. It carries a Significant hazard potential classification and has a satisfactory condition assessment.
About Upper Little Nemaha 79
The primary purpose of Upper Little Nemaha 79 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 Tr-little Nemaha River near Palmyra.
The dam stands 46 feet tall and stretches 1,022 feet across, creates a reservoir covering 28 acres, has a maximum storage capacity of 883 acre-feet, and collects water from a drainage area of 3 square miles. Completed in 1998, the structure is 28 years old.
This dam has a significant hazard potential classification, meaning that a failure could cause significant economic damage — flooding roads, bridges, or property downstream — but is not expected to result in 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 06/22/2021.
At 46 feet, this dam is taller than 91% of dams nationwide.
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Location
| State | Nebraska |
| County | Lancaster |
| Nearest City | Palmyra |
| River/Stream | Tr-little Nemaha River |
| Coordinates | 40.71601, -96.47380 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 46 ft |
| Dam Height | 38 ft |
| Dam Length | 1,022 ft |
| Year Completed | 1998 (28 years old) |
Storage & Hydraulics
| NID Storage | 883 acre-ft |
| Max Storage | 883 acre-ft |
| Normal Storage | 136 acre-ft |
| Surface Area | 28 acres |
| Drainage Area | 3 sq mi |
| Max Discharge | 4,577 cfs |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | Nemaha Natural Resources District |
| Owner Type | Local Government |
| Hazard Classification | Significant |
| Condition Assessment | Satisfactory |
| Last Inspection | 06/22/2021 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | NE02486 |
| Federal ID | NE02486 |
| More Info | State Dam Safety Program |