The Mastodon Mountain loop makes for a great early summer hike, when higher elevations are still snow-covered. The highlights are the beautiful walk through Slate Meadows and along Slate Creek as well as the grandiose views from Mastodon Mountain. The lowlight is the utter lack of water on the ridges: make sure you carry plenty!
Nelson Peak is located just east of Avery, population 25, sandwiched between the St. Joe River and its north fork. The Milwaukee Railroad put Avery on the map in the early twentieth century by routing a railroad through Montana and down the North Fork St. Joe and St. Joe river valleys. The North Fork section is now a rail-to-trail called Route of the Hiawatha. From its beginning at the St. Joe River, the Nelson Ridge trail climbs the eastern flank of Nelson Peak, traverses the southeastern face below the peak, drops down the western side along Telichpah Creek and returns to the trailhead following the St. Joe North Fork. It is a National Recreation Trail.