Nelssen Dam is an earth dam located in Webster County, Nebraska, built in 1980. It carries a Low hazard potential classification.
Dam profile
NID height · 13 ft13 ft tall and 325 ft long. 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 Nelssen Dam
The primary purpose of Nelssen Dam 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 Marvin J & M Alwilda Nelssen Trustees (private). It impounds the Tr-walnut Creek near Inavale.
The dam stands 13 feet tall and stretches 325 feet across, creates a reservoir covering 10 acres, has a maximum storage capacity of 77 acre-feet, and collects water from a drainage area of 2 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. The most recent inspection on record was 11/19/2018.
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Location
| State | Nebraska |
| County | Webster |
| Nearest City | Inavale |
| River/Stream | Tr-walnut Creek |
| Coordinates | 40.01947, -98.69858 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 13 ft |
| Dam Height | 13 ft |
| Dam Length | 325 ft |
| Year Completed | 1980 (46 years old) |
Storage & Hydraulics
| NID Storage | 77 acre-ft |
| Max Storage | 77 acre-ft |
| Normal Storage | 52 acre-ft |
| Surface Area | 10 acres |
| Drainage Area | 2 sq mi |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | Marvin J & M Alwilda Nelssen Trustees |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Last Inspection | 11/19/2018 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | NE03711 |
| Federal ID | NE03711 |
| More Info | State Dam Safety Program |