Ewen - Pence Gulch is a privately owned irrigation dam located in Big Horn, Wyoming, along the Pence Gulch stream. Constructed in 1953 by designer Thane H. Baldwin, this earth dam stands at a height of 30 feet with a hydraulic height of 25 feet and a length of 293 feet. The dam serves the primary purpose of irrigation, providing a maximum storage capacity of 118 acre-feet and a normal storage of 78 acre-feet across a surface area of 7 acres.

Despite its low hazard potential, Ewen - Pence Gulch is currently in poor condition as assessed during the last inspection in October 2017. The dam features an uncontrolled spillway and one other controlled outlet gate, with a moderate risk rating assigned. While the dam meets state regulatory requirements for permitting, inspection, and enforcement, there is a need for improved risk management measures to address its deteriorating condition. As a significant water resource structure in the area, efforts may be required to ensure the long-term safety and functionality of Ewen - Pence Gulch for both irrigation purposes and climate resilience.