Arch
Arch is an earth dam located in Johnson County, Wyoming, built in 1949. It carries a Low hazard potential classification and has a fair condition assessment.
About Arch
The primary purpose of Arch is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by Carl R. & Darleen E. Arndt Trusts (private). It impounds the Arch Creek near Kaycee.
The dam stands 30 feet tall and stretches 258 feet across, creates a reservoir covering 6 acres, and has a storage capacity of 36 acre-feet. Completed in 1949, 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 08/10/2023.
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Location
| State | Wyoming |
| County | Johnson |
| Nearest City | Kaycee |
| River/Stream | Arch Creek |
| Coordinates | 43.84917, -106.96750 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 30 ft |
| Dam Height | 30 ft |
| Dam Length | 258 ft |
| Year Completed | 1949 (77 years old) |
Storage & Hydraulics
| NID Storage | 36 acre-ft |
| Normal Storage | 36 acre-ft |
| Surface Area | 6 acres |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Irrigation |
| Owner | CARL R. & DARLEEN E. ARNDT TRUSTS |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Fair |
| Last Inspection | 08/10/2023 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | WY01541 |
| Federal ID | WY01541 |
| More Info | State Dam Safety Program |