This epic and challenging loop accesses the rugged terrain of the Sawtooth Ridge just southwest of Mt Rainier. While the first 13 miles are a steady climb on forest roads, the high traverse along the ridge and extremely steep switchbacks on the big descent make up for the earlier drudgery. Just before the start of the singletrack is a worthy side hike up to High Rock Lookout for unforgettable views of Mt Rainier. The narrow and at times overgrown trail contours high above Cora Lake and swings into several basins, passing the shores of Granite and Bertha May Lakes before the final uphill push to the shoulder of Osborne Mtn. Crossing to the south side of the ridge, you are rewarded with more views to the south from three clear cuts. The final 3.5 miles are one long series of tight switchbacks bringing you all the way to the campground where you parked. A NW Forest Pass is required to park at the trailhead.