37°32′58″N 105°40′26″W / 37.549486°N 105.673844°W
Location of Closed Basin Project in the western United States
The Closed Basin Project is a groundwater extraction project in the San Luis Valley in Colorado, United States, that began in the 1970s, and remains in operation in the 2020s. The project is managed by the United States Bureau of Reclamation.