Mile 0 - Lee's Ferry, Arizona
There are only a handful of places where travelers can cross the Colorado River, because of the deep gorges and canyons it has carved into the landscape. The natural geologic boundary between the Echo Cliffs to the east, and the beginning of Marble Canyon to the west make Lee’s Ferry the only crossing for nearly 300 miles upstream or downstream - at least until Navajo Bridge was constructed over Marble Canyon in 1929. Other dams and bridges have also been constructed, leaving Lee’s Ferry obsolete as a river crossing.