Prospect No. 1
Prospect No. 1 is an earth dam located in Sublette County, Wyoming, built in 1914. It carries a Low hazard potential classification and has a poor condition assessment.
About Prospect No. 1
The primary purpose of Prospect 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 Magagna Brothers Inc. (private). It impounds the Little Sandy Creek.
The dam stands 20 feet tall and stretches 838 feet across, creates a reservoir covering 45 acres, and has a maximum storage capacity of 957 acre-feet. Completed in 1914, the structure is over a century 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 07/18/2022.
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Location
| State | Wyoming |
| County | Sublette |
| River/Stream | Little Sandy Creek |
| Coordinates | 42.42160, -109.21400 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 20 ft |
| Dam Height | 20 ft |
| Dam Length | 838 ft |
| Year Completed | 1914 (112 years old) |
Storage & Hydraulics
| NID Storage | 957 acre-ft |
| Max Storage | 957 acre-ft |
| Normal Storage | 187 acre-ft |
| Surface Area | 45 acres |
| Max Discharge | 390 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Irrigation |
| Owner | MAGAGNA BROTHERS INC. |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Poor |
| Last Inspection | 07/18/2022 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | WY01236 |
| Federal ID | WY01236 |
| More Info | State Dam Safety Program |