This loop is one of my favorites (so far) in the gorge. The start of this loop, Grays Arch trail, is moderately easy. The terrain is pretty level, and the path is well worn. However, once you make it past Grays Arch, the trail becomes a little more difficult, and is a little harder to follow. Once on Rough trail, you head down into a ravine, under the cover of thick woods. The trail stays in the ravine for about 1/2 mile or so, and even passes trough a creek a few times. Be sure to wear some waterproof hiking boots, or you'll be rock hopping across the creek. It's not a huge problem, but it is a bit of a nuisance, and it slows you down, if you don't have on some waterproof boots. After passing through the creek, the trail starts heading back up and out of the ravine. This is definitely the most strenuous part of the hike. The next 1/2 mile is a steep incline, but there are a few basic steps to help you up. Once out of the ravine, it's a pretty even, easy hike back to the trailhead.