Although Kachina looms big and bulky, it's the youngest of the three bridges. White Canyon floodwaters still work to enlarge its span. Kachina is named for rock art symbols on the bridge that resemble symbols commonly used on kachina dolls. Kachina Bridge Dimensions: 210 feet high; 204 foot span; 44 feet wide; 93 feet thick. This is the third largest natural bridge in the world behind Rainbow Bridge and Sipapu Bridge.