Stephenson is a privately owned Earth dam located in Carbon County, Wyoming, along Big Ditch Creek. Built in 1909 for irrigation purposes, the dam stands at 9 feet high and stretches 590 feet in length, with a storage capacity of 112 acre-feet. Despite its age, the dam has a low hazard potential but is in poor condition, based on a recent assessment in April 2021. The dam has a spillway width of 40 feet and is uncontrolled in case of overflow.

The dam has not been modified in recent years and does not have outlet gates. It is regularly inspected every 5 years, with the last inspection conducted in April 2021. The risk assessment for Stephenson is considered moderate (3), highlighting the need for ongoing monitoring and potential risk management measures. Overall, Stephenson serves its primary purpose of irrigation but may require maintenance and improvements to ensure its continued safety and functionality for the surrounding community in Alcova, Wyoming.