Mary No. 1
Mary No. 1 is an earth dam located in Carbon County, Wyoming, built in 1948. It carries a Low hazard potential classification and has a poor condition assessment.
About Mary No. 1
The primary purpose of Mary No. 1 is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by Les & Shelly Dunmire Co Trustees (private). It impounds the North Fork Watkins Creek.
The dam stands 38 feet tall and stretches 450 feet across, creates a reservoir covering 10 acres, has a maximum storage capacity of 140 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1948, 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 07/07/2021.
At 38 feet, this dam is taller than 85% of dams nationwide.
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Location
| State | Wyoming |
| County | Carbon |
| River/Stream | North Fork Watkins Creek |
| Coordinates | 41.64300, -106.18410 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 38 ft |
| Dam Height | 38 ft |
| Dam Length | 450 ft |
| Year Completed | 1948 (78 years old) |
Storage & Hydraulics
| NID Storage | 140 acre-ft |
| Max Storage | 140 acre-ft |
| Normal Storage | 110 acre-ft |
| Surface Area | 10 acres |
| Drainage Area | 0 sq mi |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Irrigation |
| Owner | LES & SHELLY DUNMIRE CO TRUSTEES |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Poor |
| Last Inspection | 07/07/2021 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | WY02040 |
| Federal ID | WY02040 |
| More Info | State Dam Safety Program |