Sixty Seven is a privately owned irrigation dam located in Sublette, Wyoming, specifically in the city of Big Piney. Constructed in 1942 by David P. Miller, this Earth-type dam stands at a height of 32 feet and has a hydraulic height of 27 feet. It serves the primary purpose of irrigation for the surrounding area, with a storage capacity of 7,090 acre-feet and a normal storage level of 6,087 acre-feet. The dam spans 956 feet in length and has a surface area of 371 acres, drawing water from Spring Creek offstream.

Despite its age, Sixty Seven is regulated and inspected by the State of Wyoming, with the State Engineer's Office overseeing its operation, maintenance, and enforcement. The dam has a spillway width of 10 feet and a maximum discharge of 400 cubic feet per second, with one valve serving as its outlet gate. With a high hazard potential and moderate risk assessment, Sixty Seven poses a significant challenge for risk management and emergency preparedness. The dam's last inspection was conducted in August 2020, highlighting the importance of regular monitoring and maintenance to ensure its safety and efficiency in the face of changing climate conditions.