Upper Big Nemaha 3-a
Upper Big Nemaha 3-a is an earth dam located in Johnson County, Nebraska, built in 1985. It carries a Low hazard potential classification and has a satisfactory condition assessment.
About Upper Big Nemaha 3-a
The primary purpose of Upper Big Nemaha 3-a 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-mid Br Big Nemaha River near Sterling.
The dam stands 49 feet tall and stretches 1,075 feet across, creates a reservoir covering 35 acres, has a maximum storage capacity of 1,412 acre-feet, and collects water from a drainage area of 3 square miles. Completed in 1985, the structure is 41 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 04/28/2022.
At 49 feet, this dam is taller than 92% of dams nationwide.
Search for dams near your address to see all dams in your area with hazard classifications and safety data.
Location
| State | Nebraska |
| County | Johnson |
| Nearest City | Sterling |
| River/Stream | Tr-mid Br Big Nemaha River |
| Coordinates | 40.46911, -96.42966 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 49 ft |
| Dam Height | 44 ft |
| Dam Length | 1,075 ft |
| Year Completed | 1985 (41 years old) |
Storage & Hydraulics
| NID Storage | 1,412 acre-ft |
| Max Storage | 1,412 acre-ft |
| Normal Storage | 227 acre-ft |
| Surface Area | 35 acres |
| Drainage Area | 3 sq mi |
| Max Discharge | 2,816 cfs |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | Nemaha Natural Resources District |
| Owner Type | Local Government |
| Hazard Classification | Low |
| Condition Assessment | Satisfactory |
| Last Inspection | 04/28/2022 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | NE02199 |
| Federal ID | NE02199 |
| More Info | State Dam Safety Program |