Robber's Roost is an earth dam located in Weston County, Wyoming, built in 1955. It carries a Low hazard potential classification and has a fair condition assessment.
Dam profile
NID height · 22 ft22 ft tall and 2,080 ft long. Height is drawn to scale against a two-story house, about 25 ft; the profile is a generic embankment section and the water level is illustrative.
About Robber's Roost
The primary purpose of Robber's Roost is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by Michael V. & Alice I. Harris (private). It impounds the Robbers Roost Creek near Edgemont, Sd.
The dam stands 22 feet tall and stretches 2,080 feet across, creates a reservoir covering 183 acres, and has a maximum storage capacity of 1,989 acre-feet. Completed in 1955, 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 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 10/10/2022.
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Location
| State | Wyoming |
| County | Weston |
| Nearest City | Edgemont, Sd |
| River/Stream | Robbers Roost Creek |
| Coordinates | 43.51360, -104.25240 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 22 ft |
| Dam Height | 22 ft |
| Dam Length | 2,080 ft |
| Year Completed | 1955 (71 years old) |
Storage & Hydraulics
| NID Storage | 1,989 acre-ft |
| Max Storage | 1,989 acre-ft |
| Normal Storage | 1,250 acre-ft |
| Surface Area | 183 acres |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Irrigation |
| Owner | Michael V. & Alice I. Harris |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Fair |
| Last Inspection | 10/10/2022 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | WY00527 |
| Federal ID | WY00527 |
| More Info | State Dam Safety Program |