Ewen is a privately owned Earth dam located on Beaver Creek in Big Horn, Wyoming. Completed in 1946, it serves the primary purpose of irrigation and stands at a height of 40 feet with a hydraulic height of 35 feet. The dam has a storage capacity of 184 acre-feet and a surface area of 9 acres, providing water for agricultural activities in the area.

Despite its low hazard potential, Ewen is assessed to be in poor condition as of the last inspection in May 2017. The dam features an uncontrolled spillway with a width of 12 feet and an outlet gate consisting of a single valve. With a moderate risk assessment rating of 3, there is a need for ongoing risk management measures to ensure the safety and stability of the structure.

Located approximately 15 miles from Greybull, Ewen falls under the jurisdiction of the State Engineer's Office in Wyoming. With state permitting, inspection, and enforcement in place, efforts are being made to address the poor condition assessment and mitigate potential risks associated with the dam. This information is valuable for water resource and climate enthusiasts interested in the management and maintenance of critical infrastructure for irrigation and agricultural purposes.