Dewey Lake Trail has a total elevation difference of 1,557 feet, and that is about average. Being 12 miles long; it's longer than many wilderness hiking trails. This is a long trail, so make sure you bring plenty of supplies. Different parts of Dewey Lake Trail are at very different elevations, and that means that some parts of the wilderness hiking trail could be very different from other parts of it. This hiking trail has only one trailhead, so in and out is the way to backcountry hike it normally. This hike should take you about 1.5 days, so better have big a backpack to fit all the stuff you need.