Middle Big Nemaha 3
Middle Big Nemaha 3 is an earth dam located in Johnson County, Nebraska, built in 2000. It carries a Low hazard potential classification and has a satisfactory condition assessment.
About Middle Big Nemaha 3
The primary purpose of Middle Big Nemaha 3 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 Deer Creek near St Mary.
The dam stands 61 feet tall and stretches 1,405 feet across, creates a reservoir covering 44 acres, has a maximum storage capacity of 2,930 acre-feet, and collects water from a drainage area of 8 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 06/14/2021.
At 61 feet, this dam is taller than 95% of all dams in the United States.
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Location
| State | Nebraska |
| County | Johnson |
| Nearest City | St Mary |
| River/Stream | Deer Creek |
| Coordinates | 40.41856, -96.31926 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 61 ft |
| Dam Height | 50 ft |
| Dam Length | 1,405 ft |
| Year Completed | 2000 (26 years old) |
Storage & Hydraulics
| NID Storage | 2,930 acre-ft |
| Max Storage | 2,930 acre-ft |
| Normal Storage | 335 acre-ft |
| Surface Area | 44 acres |
| Drainage Area | 8 sq mi |
| Max Discharge | 5,114 cfs |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | Nemaha Natural Resources District |
| Owner Type | Local Government |
| Hazard Classification | Low |
| Condition Assessment | Satisfactory |
| Last Inspection | 06/14/2021 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | NE02564 |
| Federal ID | NE02564 |
| More Info | State Dam Safety Program |