Rat No. 1
Rat No. 1 is an earth dam located in Converse County, Wyoming, built in 1956. It carries a Low hazard potential classification and has a fair condition assessment.
About Rat No. 1
The primary purpose of Rat 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 Reed Land, Llc (private). It impounds the West Fork Rat Creek near Edgemont S D.
The dam stands 21 feet tall and stretches 585 feet across, creates a reservoir covering 16 acres, and has a maximum storage capacity of 191 acre-feet. Completed in 1956, 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 08/29/2022.
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Location
| State | Wyoming |
| County | Converse |
| Nearest City | Edgemont S D |
| River/Stream | West Fork Rat Creek |
| Coordinates | 43.26440, -105.11130 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 21 ft |
| Dam Height | 21 ft |
| Dam Length | 585 ft |
| Year Completed | 1956 (70 years old) |
Storage & Hydraulics
| NID Storage | 191 acre-ft |
| Max Storage | 191 acre-ft |
| Normal Storage | 91 acre-ft |
| Surface Area | 16 acres |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Irrigation |
| Owner | REED LAND, LLC |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Fair |
| Last Inspection | 08/29/2022 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | WY00519 |
| Federal ID | WY00519 |
| More Info | State Dam Safety Program |