Johnson is an earth dam located in Fremont County, Wyoming, built in 1959. It carries a Low hazard potential classification and has a poor condition assessment.
Dam profile
NID height · 32 ft32 ft tall and 355 ft long, taller than 74% 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
The primary purpose of Johnson is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by Southern Wind River Ranch LLC (private). It impounds the Twin Creek near Dallas Oil Field.
The dam stands 32 feet tall and stretches 355 feet across, creates a reservoir covering 17 acres, and has a maximum storage capacity of 228 acre-feet. Completed in 1959, 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 06/15/2022.
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Location
| State | Wyoming |
| County | Fremont |
| Nearest City | Dallas Oil Field |
| River/Stream | Twin Creek |
| Coordinates | 42.67170, -108.50050 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 32 ft |
| Dam Height | 32 ft |
| Dam Length | 355 ft |
| Year Completed | 1959 (67 years old) |
Storage & Hydraulics
| NID Storage | 228 acre-ft |
| Max Storage | 228 acre-ft |
| Normal Storage | 134 acre-ft |
| Surface Area | 17 acres |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Irrigation |
| Owner | Southern Wind River Ranch LLC |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Poor |
| Last Inspection | 06/15/2022 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | WY01056 |
| Federal ID | WY01056 |
| More Info | State Dam Safety Program |