Clark No. 1
Clark No. 1 is an earth dam located in Niobrara County, Wyoming, built in 1959. It carries a Low hazard potential classification and has a poor condition assessment.
About Clark No. 1
The primary purpose of Clark 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 Clark Land Company, Llc (private). It impounds the Alum Creek near Edgemont S D.
The dam stands 25 feet tall and stretches 956 feet across, creates a reservoir covering 39 acres, and has a maximum storage capacity of 496 acre-feet. Completed in 1959, 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 poor, meaning the dam has recognized safety deficiencies that require remediation to address risks. The most recent inspection on record was 06/26/2024.
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Location
| State | Wyoming |
| County | Niobrara |
| Nearest City | Edgemont S D |
| River/Stream | Alum Creek |
| Coordinates | 43.13722, -104.28472 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 25 ft |
| Dam Height | 25 ft |
| Dam Length | 956 ft |
| Year Completed | 1959 (67 years old) |
Storage & Hydraulics
| NID Storage | 496 acre-ft |
| Max Storage | 496 acre-ft |
| Normal Storage | 258 acre-ft |
| Surface Area | 39 acres |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Irrigation |
| Owner | CLARK LAND COMPANY, LLC |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Poor |
| Last Inspection | 06/26/2024 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | WY00743 |
| Federal ID | WY00743 |
| More Info | State Dam Safety Program |