The SI base unit for length is the metre. 1 metre is equal to 0.000621371192237 mi, or 3.28083989501 ft. Note that rounding errors may occur, so always check the results. Use this page to learn how to convert between miles and feet.
Both may be approached from AZ 98; the upper canyon (also known as Corkscrew Canyon) is reached at the end of a very sandy 2 mile 4WD track south of the road beginning near milepost 299, and it is this part which is usually visited.
Take the possibility of rainfall and flash flooding seriously when hiking the canyons of Northern Arizona. It is a good idea before you hike to study maps to identify possible escape routes. Be especially careful hiking the Grand Canyon, Marble Canyon, and Glen Canyon regions.