|The following is based on Van Buren and has not been confirmed by canon sources.|
Due to the uranium demand shortly before the Great War, the U.S. government removed the Grand Canyon's status as a national park and allowed private mining companies to exploit its supply of uranium. The resulting mess was an environmental disaster. As a result, the Canyon has become one of the deadliest places in the wasteland, home to hideous mutants seen nowhere else. Sane people avoid it.
The player was supposed to enter the canyon to locate the remains of the second B.O.M.B. orbital station. On the way, he'd encounter a handful of characters, including scavengers and Victor Presper's soldiers.
Given Grand Canyon's size, transportation over to the other side is difficult. As such, before the war, a sky tram was constructed allowing safe passage over to the other side. However, after the war, most of the mechanism was scavenged - the player would then have the opportunity to locate the lost machinery (irreplaceable after the war) and restore the tram to full functionality.
|End of information based on Van Buren.|
In 2247, the Blackfoot tribe, at war with seven other tribes in the canyon, captured Edward Sallow, Joshua Graham, and Calhoun, who were at the time working with the Followers of the Apocalypse. Edward taught the Blackfoots how to create weapons and properly wage war, and soon took over the tribe. He led the Blackfoots on an attack on the Ridgers' village, where he ordered them to surrender. When they refused, every man, woman, and child was killed. The Kaibabs were then surrounded by the Blackfoots, and were also asked to surrender. When they refused, a Kaibab envoy was directed to the Ridgers' village, and the Kaibabs soon capitulated and joined up with the Blackfoots. The Fredonians followed suit, also joining the Blackfoots. The Blackfoots had soon conquered the region. It was after this that Edward crowned himself "Caesar", and that the Legion was born.
In 2277, Legate Joshua Graham, the 'Burned Man', was covered in pitch, set alight and thrown into the canyon by Caesar, due to his failure to capture Hoover Dam during the First Battle of Hoover Dam, and the severe casualties sustained among the Legion forces during the battle.
The Grand Canyon did not appear in any of the published games, but was to appear in Van Buren, the canceled Fallout 3 project by Black Isle Studios. It was also mentioned in both Fallout 2 and Fallout: New Vegas.