Little Boxelder No. 1
Little Boxelder No. 1 is an earth dam located in Converse County, Wyoming, built in 1971. It carries a Significant hazard potential classification and has a poor condition assessment.
About Little Boxelder No. 1
The primary purpose of Little Boxelder 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 Green Valley Attn: Monte Mcnamee (private). It impounds the Little Box Elder Creek near I 25.
The dam stands 54 feet tall and stretches 1,075 feet across, creates a reservoir covering 59 acres, and has a maximum storage capacity of 1,184 acre-feet. Completed in 1971, the structure is well into its service life at over 50 years old.
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 poor, meaning the dam has recognized safety deficiencies that require remediation to address risks. The most recent inspection on record was 05/10/2023.
At 54 feet, this dam is taller than 94% of dams nationwide.
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Location
| State | Wyoming |
| County | Converse |
| Nearest City | I 25 |
| River/Stream | Little Box Elder Creek |
| Coordinates | 42.78500, -105.68500 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 54 ft |
| Dam Height | 54 ft |
| Dam Length | 1,075 ft |
| Year Completed | 1971 (55 years old) |
Storage & Hydraulics
| NID Storage | 1,184 acre-ft |
| Max Storage | 1,184 acre-ft |
| Normal Storage | 889 acre-ft |
| Surface Area | 59 acres |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Irrigation |
| Owner | GREEN VALLEY ATTN: MONTE MCNAMEE |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Poor |
| Last Inspection | 05/10/2023 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | WY00331 |
| Federal ID | WY00331 |
| More Info | State Dam Safety Program |