Located in Johnson, Wyoming, the Patch dam on Muddy Creek serves primarily for irrigation purposes. Completed in 1958, this privately owned structure stands at a height of 44 feet and boasts a storage capacity of 473 acre-feet. Despite its age, the dam's hazard potential is classified as low, with a moderate risk assessment rating.

With a spillway type of "Uncontrolled" and a single valve outlet gate, Patch dam's condition assessment is marked as poor as of August 2018. The dam's structural height matches its dam height at 44 feet, with a hydraulic height of 38 feet. Although the dam has not been modified over the years, regular inspections every five years ensure its ongoing safety and functionality.

Despite its modest surface area of 26.14 acres and lack of a drainage area, Patch dam plays a critical role in supporting local agriculture through its irrigation capabilities. Enthusiasts of water resources and climate will find Patch's unique design and historical significance to be a compelling case study in sustainable water management practices within the state of Wyoming.