West Side No. 4
West Side No. 4 is an earth dam located in Converse County, Wyoming, built in 1946. It carries a Low hazard potential classification and has a fair condition assessment.
About West Side No. 4
The primary purpose of West Side No. 4 is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by Green Valley Attn: Monte L. Mcnamee (private). It impounds the La Prele Creek Offstream near Douglas.
The dam stands 23 feet tall and stretches 236 feet across, creates a reservoir covering 10 acres, and has a maximum storage capacity of 123 acre-feet. Completed in 1946, 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 05/10/2023.
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Location
| State | Wyoming |
| County | Converse |
| Nearest City | Douglas |
| River/Stream | La Prele Creek Offstream |
| Coordinates | 42.81167, -105.63333 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 23 ft |
| Dam Height | 23 ft |
| Dam Length | 236 ft |
| Year Completed | 1946 (80 years old) |
Storage & Hydraulics
| NID Storage | 123 acre-ft |
| Max Storage | 123 acre-ft |
| Normal Storage | 61 acre-ft |
| Surface Area | 10 acres |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Irrigation |
| Owner | GREEN VALLEY ATTN: MONTE L. McNAMEE |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Fair |
| Last Inspection | 05/10/2023 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | WY00194 |
| Federal ID | WY00194 |
| More Info | State Dam Safety Program |