Grosvenor Arch is actually two sandstone arches towering 150ft/45m above the ground located in the north western corner of the Grand Staircase Escalante National Monument. The largest arch is nearly 100ft/30m in diameter. You can walk right up under the arches and look up into the sky. To get to the arch requires a short walk, on a concrete sidewalk, from the parking lot. There are pit toilet restrooms available.
Take state route 12 south of Cannonville for approximately 9 miles. This is a paved road to the Kodachrome State Park turnoff. Continue on Cottonwood Canyon Road, a graded dirt road, for another 10 miles to the Grosvenor Arch parking lot. Cottonwood Canyon Road continues through the Grand Staircase Escalante NM.
Note: The arch was named after Gilbert Hovey Grosvenor, president of the National Geographic Society - the first full time editor of National Geographic Magazine.