# The flow of water in the [[Colorado River]] has been declining since the early 20th century, even after usage is considered, and the man-made Lake Mead is at risk of drying up on the next decade.<ref>http://www.nytimes.com/2008/02/13/us/13mead.html</ref> | # The flow of water in the [[Colorado River]] has been declining since the early 20th century, even after usage is considered, and the man-made Lake Mead is at risk of drying up on the next decade.<ref>http://www.nytimes.com/2008/02/13/us/13mead.html</ref> |