The Grand Canyon Skywalk is a transparent horseshoe-shaped cantilever bridge and tourist attraction in Arizona near the Colorado River on the edge of a side canyon in the Grand Canyon West area of the main canyon.  USGS topographic maps show the elevation at the Skywalk’s location as 4,770ft (1,450m) and the elevation of the Colorado River in the base of the canyon as 1,160ft (350m), and they show that the height of the precisely vertical drop directly under the skywalk is between 500ft (150m) and 800ft (240m).

Grand Canyon Skywalk

Source: CE Grand Canyon