Elsie is an earth dam located in Converse County, Wyoming, built in 1975. It carries a Significant hazard potential classification and has a poor condition assessment.
Dam profile
NID height · 39 ft39 ft tall and 328 ft long, taller than 85% of U.S. dams with a recorded height. Height is drawn to scale against a two-story house, about 25 ft; the profile is a generic embankment section and the water level is illustrative.
About Elsie
The primary purpose of Elsie is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by Elsie Deininger (private). It impounds the Moss Agate Creek near Douglas.
The dam stands 39 feet tall and stretches 328 feet across, creates a reservoir covering 6 acres, has a maximum storage capacity of 51 acre-feet, and collects water from a drainage area of 2 square miles. Completed in 1975, 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 05/18/2023.
At 39 feet, this dam is taller than 85% of dams nationwide.
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Location
| State | Wyoming |
| County | Converse |
| Nearest City | Douglas |
| River/Stream | Moss Agate Creek |
| Coordinates | 42.65200, -105.67500 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 39 ft |
| Dam Height | 39 ft |
| Dam Length | 328 ft |
| Year Completed | 1975 (51 years old) |
Storage & Hydraulics
| NID Storage | 51 acre-ft |
| Max Storage | 51 acre-ft |
| Normal Storage | 51 acre-ft |
| Surface Area | 6 acres |
| Drainage Area | 2 sq mi |
| Max Discharge | 5,597 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Irrigation |
| Owner | Elsie Deininger |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Poor |
| Last Inspection | 05/18/2023 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | WY01338 |
| Federal ID | WY01338 |
| More Info | State Dam Safety Program |