J. O.
J. O. is an earth dam located in Carbon County, Wyoming, built in 1946. It carries a Low hazard potential classification and has a poor condition assessment.
About J. O.
The primary purpose of J. O. is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by Three Forks Ranch Corporation (private). It impounds the Cow Creek near Baggs.
The dam stands 30 feet tall and stretches 540 feet across, creates a reservoir covering 11 acres, and has a maximum storage capacity of 165 acre-feet. Completed in 1946, the structure is well-established, with more than 75 years of service.
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 06/11/2025.
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Location
| State | Wyoming |
| County | Carbon |
| Nearest City | Baggs |
| River/Stream | Cow Creek |
| Coordinates | 41.40020, -107.53170 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 30 ft |
| Dam Height | 30 ft |
| Dam Length | 540 ft |
| Year Completed | 1946 (80 years old) |
Storage & Hydraulics
| NID Storage | 165 acre-ft |
| Max Storage | 165 acre-ft |
| Normal Storage | 109 acre-ft |
| Surface Area | 11 acres |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Irrigation |
| Owner | THREE FORKS RANCH CORPORATION |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Poor |
| Last Inspection | 06/11/2025 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | WY00382 |
| Federal ID | WY00382 |
| More Info | State Dam Safety Program |