Hannah Mahoney No. 2
Hannah Mahoney No. 2 is an earth dam located in Carbon County, Wyoming, built in 1909. It carries a Low hazard potential classification and has a fair condition assessment.
About Hannah Mahoney No. 2
The primary purpose of Hannah Mahoney 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 Ferris Mountain Ranch (private). It impounds the Muddy Creek near Muddy Gap.
The dam stands 22 feet tall and stretches 590 feet across, creates a reservoir covering 11 acres, and has a maximum storage capacity of 107 acre-feet. Completed in 1909, the structure is over a century 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 fair — the dam has minor deficiencies that are being addressed or do not pose an immediate safety threat. The most recent inspection on record was 10/05/2021.
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Location
| State | Wyoming |
| County | Carbon |
| Nearest City | Muddy Gap |
| River/Stream | Muddy Creek |
| Coordinates | 42.25830, -107.43280 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 22 ft |
| Dam Height | 22 ft |
| Dam Length | 590 ft |
| Year Completed | 1909 (117 years old) |
Storage & Hydraulics
| NID Storage | 107 acre-ft |
| Max Storage | 107 acre-ft |
| Normal Storage | 74 acre-ft |
| Surface Area | 11 acres |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Irrigation |
| Owner | FERRIS MOUNTAIN RANCH |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Fair |
| Last Inspection | 10/05/2021 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | WY00378 |
| Federal ID | WY00378 |
| More Info | State Dam Safety Program |