Four Mile is a privately-owned earth dam located in Johnson, Wyoming, along Four Mile Creek. Built in 1944 for irrigation purposes, this dam stands at 18 feet high with a hydraulic height of 13 feet and a length of 700 feet. It has a storage capacity of 136 acre-feet and a surface area of 12 acres, serving as a vital resource for the surrounding agricultural community.

Despite its low hazard potential, the dam is currently in poor condition, as assessed in 2017. Regular inspections are conducted every 5 years to ensure its safety and functionality. With a spillway width of 200 feet and an uncontrolled spillway type, the dam's risk assessment indicates a moderate level of risk (3) and highlights the need for ongoing risk management measures to address potential concerns.

Located in a beautiful natural setting, Four Mile dam represents a historic piece of infrastructure that requires maintenance and attention to continue serving its irrigation purpose effectively. Water resource and climate enthusiasts can appreciate the importance of preserving and managing such structures to safeguard water supplies and mitigate risks associated with aging infrastructure.