Patch is an earth dam located in Johnson County, Wyoming, built in 1958. It carries a Low hazard potential classification and has a poor condition assessment.
Dam profile
NID height · 44 ft44 ft tall and 916 ft long, taller than 89% 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 Patch
The primary purpose of Patch is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by The Jhj Ranch, LLC (private). It impounds the Muddy Creek near Arvada.
The dam stands 44 feet tall and stretches 916 feet across, creates a reservoir covering 26 acres, and has a maximum storage capacity of 473 acre-feet. Completed in 1958, the structure is well into its service life at over 50 years old.
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 poor, meaning the dam has recognized safety deficiencies that require remediation to address risks. The most recent inspection on record was 06/06/2023.
At 44 feet, this dam is taller than 89% of dams nationwide.
Search for dams near your address to see all dams in your area with hazard classifications and safety data.
Location
| State | Wyoming |
| County | Johnson |
| Nearest City | Arvada |
| River/Stream | Muddy Creek |
| Coordinates | 44.17528, -106.79167 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 44 ft |
| Dam Height | 44 ft |
| Dam Length | 916 ft |
| Year Completed | 1958 (68 years old) |
Storage & Hydraulics
| NID Storage | 473 acre-ft |
| Max Storage | 473 acre-ft |
| Normal Storage | 323 acre-ft |
| Surface Area | 26 acres |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Irrigation |
| Owner | The Jhj Ranch, LLC |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Poor |
| Last Inspection | 06/06/2023 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | WY00832 |
| Federal ID | WY00832 |
| More Info | State Dam Safety Program |