Kelly is an earth dam located in Johnson County, Wyoming, built in 1973. It carries a Significant hazard potential classification and has a poor condition assessment.
Dam profile
NID height · 26 ft26 ft tall and 950 ft long, taller than 55% 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 Kelly
The primary purpose of Kelly is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by Wyoming Construction Materials LLC (private). It impounds the Kelly Creek near Arvada.
The dam stands 26 feet tall and stretches 950 feet across, creates a reservoir covering 11 acres, and has a maximum storage capacity of 109 acre-feet. Completed in 1973, 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 06/06/2023.
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Location
| State | Wyoming |
| County | Johnson |
| Nearest City | Arvada |
| River/Stream | Kelly Creek |
| Coordinates | 44.18556, -106.70389 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 26 ft |
| Dam Height | 26 ft |
| Dam Length | 950 ft |
| Year Completed | 1973 (53 years old) |
Storage & Hydraulics
| NID Storage | 109 acre-ft |
| Max Storage | 109 acre-ft |
| Normal Storage | 102 acre-ft |
| Surface Area | 11 acres |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Irrigation |
| Owner | Wyoming Construction Materials LLC |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Poor |
| Last Inspection | 06/06/2023 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | WY00785 |
| Federal ID | WY00785 |
| More Info | State Dam Safety Program |