Upper Big Nemaha G-18a is an earth dam located in Gage County, Nebraska, built in 1974. It carries a Low hazard potential classification and has a satisfactory condition assessment.
Dam profile
NID height · 26 ft26 ft tall and 734 ft long, taller than 55% of U.S. dams with a recorded height. Height is drawn to scale against a two-story house, about 25 ft; the profile is a generic embankment section and the water level is illustrative.
About Upper Big Nemaha G-18a
Upper Big Nemaha G-18a is a dam in Gage, Nebraska. The dam is owned by Nemaha Natural Resources District (local government). It impounds the Jakes Creek near Adams.
The dam stands 26 feet tall and stretches 734 feet across, creates a reservoir covering 15 acres, has a maximum storage capacity of 254 acre-feet, and collects water from a drainage area of 1 square miles. Completed in 1974, the structure is well into its service life at over 50 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 05/19/2020.
Search for dams near your address to see all dams in your area with hazard classifications and safety data.
Location
| State | Nebraska |
| County | Gage |
| Nearest City | Adams |
| River/Stream | Jakes Creek |
| Coordinates | 40.43299, -96.57296 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 26 ft |
| Dam Height | 24 ft |
| Dam Length | 734 ft |
| Year Completed | 1974 (52 years old) |
Storage & Hydraulics
| NID Storage | 254 acre-ft |
| Max Storage | 254 acre-ft |
| Normal Storage | 77 acre-ft |
| Surface Area | 15 acres |
| Drainage Area | 1 sq mi |
| Max Discharge | 590 cfs |
Ownership & Safety
| Purpose | Other |
| Owner | Nemaha Natural Resources District |
| Owner Type | Local Government |
| Hazard Classification | Low |
| Condition Assessment | Satisfactory |
| Last Inspection | 05/19/2020 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | NE01014 |
| Federal ID | NE01014 |
| More Info | State Dam Safety Program |