Upper Big Nemaha 27-r
Upper Big Nemaha 27-r is an earth dam located in Gage County, Nebraska, built in 1986. It carries a Significant hazard potential classification and has a satisfactory condition assessment.
About Upper Big Nemaha 27-r
The primary purpose of Upper Big Nemaha 27-r 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 Shaw Creek near Adams.
The dam stands 32 feet tall and stretches 895 feet across, creates a reservoir covering 60 acres, has a maximum storage capacity of 1,531 acre-feet, and collects water from a drainage area of 4 square miles. Completed in 1986, the structure is 40 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 05/05/2022.
At 32 feet, this dam is taller than 76% of dams nationwide.
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Location
| State | Nebraska |
| County | Gage |
| Nearest City | Adams |
| River/Stream | Shaw Creek |
| Coordinates | 40.46617, -96.62647 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 32 ft |
| Dam Height | 30 ft |
| Dam Length | 895 ft |
| Year Completed | 1986 (40 years old) |
Storage & Hydraulics
| NID Storage | 1,531 acre-ft |
| Max Storage | 1,531 acre-ft |
| Normal Storage | 279 acre-ft |
| Surface Area | 60 acres |
| Drainage Area | 4 sq mi |
| Max Discharge | 539 cfs |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | Nemaha Natural Resources District |
| Owner Type | Local Government |
| Hazard Classification | Significant |
| Condition Assessment | Satisfactory |
| Last Inspection | 05/05/2022 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | NE02212 |
| Federal ID | NE02212 |
| More Info | State Dam Safety Program |