Mcninch No. 2
Mcninch No. 2 is an earth dam located in Sublette County, Wyoming, built in 1957. It carries a Low hazard potential classification and has a poor condition assessment.
About Mcninch No. 2
The primary purpose of Mcninch No. 2 is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by Tf Land & Cattle Llc (private). It impounds the Mcninch Draw near Big Piney.
The dam stands 27 feet tall and stretches 1,113 feet across, creates a reservoir covering 43 acres, has a maximum storage capacity of 760 acre-feet, and collects water from a drainage area of 7 square miles. Completed in 1957, 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 06/06/2025.
Search for dams near your address to see all dams in your area with hazard classifications and safety data.
Location
| State | Wyoming |
| County | Sublette |
| Nearest City | Big Piney |
| River/Stream | Mcninch Draw |
| Coordinates | 42.59610, -110.25920 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 27 ft |
| Dam Height | 27 ft |
| Dam Length | 1,113 ft |
| Year Completed | 1957 (69 years old) |
Storage & Hydraulics
| NID Storage | 760 acre-ft |
| Max Storage | 760 acre-ft |
| Normal Storage | 357 acre-ft |
| Surface Area | 43 acres |
| Drainage Area | 7 sq mi |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Irrigation |
| Owner | TF LAND & CATTLE LLC |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Poor |
| Last Inspection | 06/06/2025 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | WY01274 |
| Federal ID | WY01274 |
| More Info | State Dam Safety Program |