Hanna is a concrete dam located in Carbon County, Wyoming, built in 1934. It carries a Low hazard potential classification and has a fair condition assessment.
Dam profile
NID height · 25 ft25 ft tall and 594 ft long, taller than 50% of U.S. dams with a recorded height. Height is drawn to scale against a two-story house, about 25 ft; the profile is a generic concrete gravity section and the water level is illustrative.
About Hanna
Hanna is a dam in Carbon, Wyoming. The dam is owned by Town of Hanna (richard Gregory) (local government). It impounds the Rattlesnake Creek.
The dam stands 25 feet tall and stretches 594 feet across, creates a reservoir covering 4 acres, and has a storage capacity of 62 acre-feet. Completed in 1934, 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 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 06/28/2022.
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Location
| State | Wyoming |
| County | Carbon |
| River/Stream | Rattlesnake Creek |
| Coordinates | 41.83180, -106.58880 |
Physical Characteristics
| Dam Type | Concrete |
| NID Height | 25 ft |
| Dam Height | 25 ft |
| Dam Length | 594 ft |
| Year Completed | 1934 (92 years old) |
Storage & Hydraulics
| NID Storage | 62 acre-ft |
| Normal Storage | 62 acre-ft |
| Surface Area | 4 acres |
| Spillway Type | None |
Ownership & Safety
| Purpose | Other |
| Owner | Town of Hanna (richard Gregory) |
| Owner Type | Local Government |
| Hazard Classification | Low |
| Condition Assessment | Fair |
| Last Inspection | 06/28/2022 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | WY01683 |
| Federal ID | WY01683 |
| More Info | State Dam Safety Program |