Middle Big Nemaha 9
Middle Big Nemaha 9 is an earth dam located in Johnson County, Nebraska, built in 1995. It carries a Low hazard potential classification and has a satisfactory condition assessment.
About Middle Big Nemaha 9
The primary purpose of Middle Big Nemaha 9 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-yankee Creek near Crab Orchard.
The dam stands 44 feet tall and stretches 785 feet across, creates a reservoir covering 27 acres, has a maximum storage capacity of 1,096 acre-feet, and collects water from a drainage area of 3 square miles. Completed in 1995, the structure is 31 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 05/14/2021.
At 44 feet, this dam is taller than 90% of dams nationwide.
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Location
| State | Nebraska |
| County | Johnson |
| Nearest City | Crab Orchard |
| River/Stream | Tr-yankee Creek |
| Coordinates | 40.31504, -96.43725 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 44 ft |
| Dam Height | 39 ft |
| Dam Length | 785 ft |
| Year Completed | 1995 (31 years old) |
Storage & Hydraulics
| NID Storage | 1,096 acre-ft |
| Max Storage | 1,096 acre-ft |
| Normal Storage | 149 acre-ft |
| Surface Area | 27 acres |
| Drainage Area | 3 sq mi |
| Max Discharge | 1,813 cfs |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | Nemaha Natural Resources District |
| Owner Type | Local Government |
| Hazard Classification | Low |
| Condition Assessment | Satisfactory |
| Last Inspection | 05/14/2021 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | NE02471 |
| Federal ID | NE02471 |
| More Info | State Dam Safety Program |