Thompson Dam 4174 is an earth dam located in Sarpy County, Nebraska, built in 2000. It carries a Low hazard potential classification and has a poor condition assessment.
Dam profile
NID height · 35 ft35 ft tall and 635 ft long, taller than 80% 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 Thompson Dam 4174
The primary purpose of Thompson Dam 4174 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 James & Cynthia Thompson (private). It impounds the Tr-platte River.
The dam stands 35 feet tall and stretches 635 feet across, creates a reservoir covering 4 acres, has a maximum storage capacity of 175 acre-feet, and collects water from a drainage area of 1 square miles. Completed in 2000, the structure is 26 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 poor, meaning the dam has recognized safety deficiencies that require remediation to address risks. The most recent inspection on record was 10/03/2022.
At 35 feet, this dam is taller than 80% of dams nationwide.
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Location
| State | Nebraska |
| County | Sarpy |
| Nearest City | None |
| River/Stream | Tr-platte River |
| Coordinates | 41.02156, -96.20255 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 35 ft |
| Dam Height | 35 ft |
| Dam Length | 635 ft |
| Year Completed | 2000 (26 years old) |
Storage & Hydraulics
| NID Storage | 175 acre-ft |
| Max Storage | 175 acre-ft |
| Normal Storage | 14 acre-ft |
| Surface Area | 4 acres |
| Drainage Area | 1 sq mi |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | James & Cynthia Thompson |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Poor |
| Last Inspection | 10/03/2022 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | NE04174 |
| Federal ID | NE04174 |
| More Info | State Dam Safety Program |