East Side No. 3
East Side No. 3 is an earth dam located in Converse County, Wyoming, built in 1966. It carries a Significant hazard potential classification and has a poor condition assessment.
About East Side No. 3
The primary purpose of East Side No. 3 is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by Laprele Irrigation District (private). It impounds the Five Mile Creek near Douglas.
The dam stands 25 feet tall and stretches 725 feet across, creates a reservoir covering 14 acres, has a maximum storage capacity of 200 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1966, 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 05/22/2025.
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Location
| State | Wyoming |
| County | Converse |
| Nearest City | Douglas |
| River/Stream | Five Mile Creek |
| Coordinates | 42.77660, -105.51610 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 25 ft |
| Dam Height | 25 ft |
| Dam Length | 725 ft |
| Year Completed | 1966 (60 years old) |
Storage & Hydraulics
| NID Storage | 200 acre-ft |
| Max Storage | 200 acre-ft |
| Normal Storage | 117 acre-ft |
| Surface Area | 14 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 2,462 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Irrigation |
| Owner | LAPRELE IRRIGATION DISTRICT |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Poor |
| Last Inspection | 05/22/2025 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | WY00193 |
| Federal ID | WY00193 |
| More Info | State Dam Safety Program |