Allen
Allen is an earth dam located in Sheridan County, Wyoming, built in 1955. It carries a Low hazard potential classification and has a poor condition assessment.
About Allen
The primary purpose of Allen is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by S.k. Johnston, Jr. (private). It impounds the Sackett Creek near Sheridan.
The dam stands 35 feet tall and stretches 260 feet across, creates a reservoir covering 3 acres, and has a maximum storage capacity of 50 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 poor, meaning the dam has recognized safety deficiencies that require remediation to address risks. The most recent inspection on record was 09/09/2021.
At 35 feet, this dam is taller than 82% of dams nationwide.
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Location
| State | Wyoming |
| County | Sheridan |
| Nearest City | Sheridan |
| River/Stream | Sackett Creek |
| Coordinates | 44.64400, -106.96890 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 35 ft |
| Dam Height | 35 ft |
| Dam Length | 260 ft |
| Year Completed | 1955 (71 years old) |
Storage & Hydraulics
| NID Storage | 50 acre-ft |
| Max Storage | 50 acre-ft |
| Normal Storage | 30 acre-ft |
| Surface Area | 3 acres |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Irrigation |
| Owner | S.K. JOHNSTON, JR. |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Poor |
| Last Inspection | 09/09/2021 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | WY00646 |
| Federal ID | WY00646 |
| More Info | State Dam Safety Program |