South Fork
South Fork is an earth dam located in Johnson County, Wyoming, built in 1973. It carries a Low hazard potential classification and has a poor condition assessment.
About South Fork
The primary purpose of South Fork is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by Ramsbottom Ranch (private). It impounds the South Fork Crazy Woman near Arvada.
The dam stands 26 feet tall and stretches 1,800 feet across, creates a reservoir covering 25 acres, and has a maximum storage capacity of 317 acre-feet. Completed in 1973, 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 06/07/2023.
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Location
| State | Wyoming |
| County | Johnson |
| Nearest City | Arvada |
| River/Stream | South Fork Crazy Woman |
| Coordinates | 43.95972, -106.68944 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 26 ft |
| Dam Height | 26 ft |
| Dam Length | 1,800 ft |
| Year Completed | 1973 (53 years old) |
Storage & Hydraulics
| NID Storage | 317 acre-ft |
| Max Storage | 317 acre-ft |
| Normal Storage | 241 acre-ft |
| Surface Area | 25 acres |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Irrigation |
| Owner | RAMSBOTTOM RANCH |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Poor |
| Last Inspection | 06/07/2023 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | WY01041 |
| Federal ID | WY01041 |
| More Info | State Dam Safety Program |