Upper Big Nemaha J-12
Upper Big Nemaha J-12 is an earth dam located in Johnson County, Nebraska, built in 1980. It carries a Low hazard potential classification and has a fair condition assessment.
About Upper Big Nemaha J-12
Upper Big Nemaha J-12 is a dam in Johnson, Nebraska. The dam is owned by Nemaha Natural Resources District (local government). It impounds the Tr-n Fk Big Nemaha River near Sterling.
The dam stands 44 feet tall and stretches 715 feet across, creates a reservoir covering 11 acres, has a maximum storage capacity of 306 acre-feet, and collects water from a drainage area of 1 square miles. Completed in 1980, the structure is 46 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 fair — the dam has minor deficiencies that are being addressed or do not pose an immediate safety threat. The most recent inspection on record was 06/14/2021.
At 44 feet, this dam is taller than 90% 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-n Fk Big Nemaha River |
| Coordinates | 40.49550, -96.42243 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 44 ft |
| Dam Height | 43 ft |
| Dam Length | 715 ft |
| Year Completed | 1980 (46 years old) |
Storage & Hydraulics
| NID Storage | 306 acre-ft |
| Max Storage | 306 acre-ft |
| Normal Storage | 55 acre-ft |
| Surface Area | 11 acres |
| Drainage Area | 1 sq mi |
| Max Discharge | 722 cfs |
Ownership & Safety
| Purpose | Other |
| Owner | Nemaha Natural Resources District |
| Owner Type | Local Government |
| Hazard Classification | Low |
| Condition Assessment | Fair |
| Last Inspection | 06/14/2021 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | NE01299 |
| Federal ID | NE01299 |
| More Info | State Dam Safety Program |