Middle Big Nemaha 18
Middle Big Nemaha 18 is an earth dam located in Johnson County, Nebraska, built in 2003. It carries a Significant hazard potential classification and has a satisfactory condition assessment.
About Middle Big Nemaha 18
The primary purpose of Middle Big 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 Brewers Branch near Tecumseh.
The dam stands 56 feet tall and stretches 844 feet across, creates a reservoir covering 18 acres, has a maximum storage capacity of 1,114 acre-feet, and collects water from a drainage area of 3 square miles. Completed in 2003, the structure is relatively new.
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 04/04/2022.
At 56 feet, this dam is taller than 94% of dams nationwide.
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Location
| State | Nebraska |
| County | Johnson |
| Nearest City | Tecumseh |
| River/Stream | Brewers Branch |
| Coordinates | 40.35971, -96.29742 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 56 ft |
| Dam Height | 50 ft |
| Dam Length | 844 ft |
| Year Completed | 2003 (23 years old) |
Storage & Hydraulics
| NID Storage | 1,114 acre-ft |
| Max Storage | 1,114 acre-ft |
| Normal Storage | 134 acre-ft |
| Surface Area | 18 acres |
| Drainage Area | 3 sq mi |
| Max Discharge | 4,334 cfs |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | Nemaha Natural Resources District |
| Owner Type | Local Government |
| Hazard Classification | Significant |
| Condition Assessment | Satisfactory |
| Last Inspection | 04/04/2022 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | NE02664 |
| Federal ID | NE02664 |
| More Info | State Dam Safety Program |