Dallman Dam is an earth dam located in Franklin County, Nebraska, built in 1960. It carries a Low hazard potential classification and has a poor condition assessment.
Dam profile
NID height · 22 ft22 ft tall and 265 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 Dallman Dam
The primary purpose of Dallman 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 Randall D & Elvera E Dallman Trust (private). It impounds the Tr-w Br Thompson Creek.
The dam stands 22 feet tall and stretches 265 feet across, creates a reservoir covering 5 acres, has a maximum storage capacity of 106 acre-feet, and collects water from a drainage area of 1 square miles. Completed in 1960, 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 poor, meaning the dam has recognized safety deficiencies that require remediation to address risks. The most recent inspection on record was 08/14/2019.
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Location
| State | Nebraska |
| County | Franklin |
| Nearest City | None |
| River/Stream | Tr-w Br Thompson Creek |
| Coordinates | 40.18246, -98.91085 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 22 ft |
| Dam Height | 22 ft |
| Dam Length | 265 ft |
| Year Completed | 1960 (66 years old) |
Storage & Hydraulics
| NID Storage | 106 acre-ft |
| Max Storage | 106 acre-ft |
| Normal Storage | 17 acre-ft |
| Surface Area | 5 acres |
| Drainage Area | 1 sq mi |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | Randall D & Elvera E Dallman Trust |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Poor |
| Last Inspection | 08/14/2019 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | NE03805 |
| Federal ID | NE03805 |
| More Info | State Dam Safety Program |