The Kajan Diversion, located in Camp Crook, South Dakota, is a privately owned irrigation structure completed in 1965 on Thompson Creek. This earth dam stands at 19 feet high with a hydraulic height of 14 feet, serving primarily for irrigation purposes. With a storage capacity of 694 acre-feet, the dam spans 3200 feet in length and covers a surface area of 102 acres. Despite being regulated by the State of Wyoming, the dam is considered to have a low hazard potential and is currently in fair condition as of the last inspection in June 2021.

The Kajan Diversion features an uncontrolled spillway with a width of 600 feet and two slide gates for outlet control. Its risk assessment deems the structure to have a moderate risk level, with a risk management plan yet to be defined. The dam is inspected every five years, with the last assessment conducted in June 2021. Overall, the Kajan Diversion serves as a vital irrigation resource in Crook County, Wyoming, showcasing the importance of water infrastructure in sustaining agricultural practices in the region.