Johnson Dam 672 is an earth dam located in Sheridan County, Nebraska, built in 1969. It carries a Low hazard potential classification and has a poor condition assessment.
Dam profile
NID height · 25 ft25 ft tall and 360 ft long, taller than 50% 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 Johnson Dam 672
The primary purpose of Johnson Dam 672 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 Quarter Circle J Ranch Inc (private). It impounds the Tr-whiteclay Creek near Whiteclay.
The dam stands 25 feet tall and stretches 360 feet across, creates a reservoir covering 19 acres, has a maximum storage capacity of 288 acre-feet, and collects water from a drainage area of 5 square miles. Completed in 1969, 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 05/19/2020.
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Location
| State | Nebraska |
| County | Sheridan |
| Nearest City | Whiteclay |
| River/Stream | Tr-whiteclay Creek |
| Coordinates | 42.82324, -102.50638 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 25 ft |
| Dam Height | 25 ft |
| Dam Length | 360 ft |
| Year Completed | 1969 (57 years old) |
Storage & Hydraulics
| NID Storage | 288 acre-ft |
| Max Storage | 288 acre-ft |
| Normal Storage | 112 acre-ft |
| Surface Area | 19 acres |
| Drainage Area | 5 sq mi |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | Quarter Circle J Ranch Inc |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Poor |
| Last Inspection | 05/19/2020 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | NE00672 |
| Federal ID | NE00672 |
| More Info | State Dam Safety Program |