Enl. George H. Marshall is a private irrigation dam located in Arvada, Wyoming, along the Yoga Draw river. Constructed in 2007, this earth dam stands at a height of 37 feet, with a hydraulic height of 31 feet and a structural height of 46 feet. The dam provides a maximum storage capacity of 95 acre-feet and a normal storage of 64 acre-feet, covering a surface area of 6.83 acres in Johnson County.

Managed under state jurisdiction with regulatory oversight from the State Engineer's Office, Enl. George H. Marshall has a low hazard potential and fair condition assessment. 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, the dam underwent its last inspection in April 2018, with an inspection frequency of every 5 years. Despite its age, the dam continues to serve its primary purpose of irrigation effectively, showcasing the importance of water resource management in the region.