Lone Tree is a privately owned dam located in Crook, Wyoming, along Lone Tree Creek. Built in 1955, this earth dam serves multiple purposes including fire protection, stock watering, and small fish pond maintenance. With a structural height of 17 feet and a hydraulic height of 12 feet, the dam has a storage capacity of 327 acre-feet and a normal storage level of 133 acre-feet.

Despite its low hazard potential, Lone Tree is in poor condition as of the last inspection in July 2018. The dam has an uncontrolled spillway with a width of 100 feet and no outlet gates. The risk assessment for Lone Tree is moderate, with certain areas of concern identified that may require risk management measures in the future. It is important for water resource and climate enthusiasts to monitor the condition of Lone Tree and ensure that appropriate maintenance and safety measures are put in place to mitigate any potential risks associated with the dam.