Wyoming Hereford Ranch No. 1
Wyoming Hereford Ranch No. 1 is an earth dam located in Laramie County, Wyoming, built in 1930. It carries a Significant hazard potential classification and has a fair condition assessment.
About Wyoming Hereford Ranch No. 1
The primary purpose of Wyoming Hereford Ranch 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 J. Sloan Hales & Dean Fogg & D. Lummis (private). It impounds the Crow Creek near Altvan.
The dam stands 28 feet tall and stretches 1,300 feet across, creates a reservoir covering 109 acres, has a maximum storage capacity of 1,622 acre-feet, and collects water from a drainage area of 318 square miles. Completed in 1930, the structure is well-established, with more than 75 years of service.
This dam has a significant hazard potential classification, meaning that a failure could cause significant economic damage — flooding roads, bridges, or property downstream — but is not expected to result in 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 09/10/2021.
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Location
| State | Wyoming |
| County | Laramie |
| Nearest City | Altvan |
| River/Stream | Crow Creek |
| Coordinates | 41.11833, -104.73500 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 28 ft |
| Dam Height | 28 ft |
| Dam Length | 1,300 ft |
| Year Completed | 1930 (96 years old) |
Storage & Hydraulics
| NID Storage | 1,622 acre-ft |
| Max Storage | 1,622 acre-ft |
| Normal Storage | 878 acre-ft |
| Surface Area | 109 acres |
| Drainage Area | 318 sq mi |
| Max Discharge | 7,180 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Irrigation |
| Owner | J. SLOAN HALES & DEAN FOGG & D. LUMMIS |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Fair |
| Last Inspection | 09/10/2021 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | WY00010 |
| Federal ID | WY00010 |
| More Info | State Dam Safety Program |