"Kolob Arch is probably the largest natural arch in the world. Accurate measurement of its size is difficult because of its location, high above the canyon floor, but recent calculations place its span somewhere between 292 and 310 feet. The arch lies near the top of the Navajo Sandstone cliffs on the north side of La Verkin Creek, about 700 feet above the trail. It faces east, so the best time to see and photograph Kolob Arch is in the morning before about 10:00 a.m.
There are three possible ways to walk to Kolob Arch, but the Hop Valley Trail, suggested here, is the most scenic approach. This trail starts on the Kolob Plateau, south of La Verkin Creek, and proceeds down the colorful Hop Valley Canyon to its confluence with La Verkin. The canyon is about 200 yards wide, with a flat, grassy bottom boxed in on both sides by towering cliffs of red sandstone. A shallow stream, fed by runoff from a half dozen side canyons, keeps the bottom of the narrow valley green, while, in the distance, one can see the picturesque maze of mesas and canyons that surround the confluence of Hop Valley and La Verkin Creek."