Marshall Lake is located on the northern end of the Sawtooth National Wilderness Area, Custer County, Idaho, USA. The lake sits at 7,715 feet (2,352m) above sea-level and is a 4.5 mile (7.2km) hike from the nearest trailhead, which is Redfish Lake Campground. Redfish Lake Campground is 6.2 miles (10km) by road south from the town of Stanley, Idaho. The hike to the lake is all on a maintained Forest Service trail (other than the hike up the hill where this image was taken from). The total elevation change of the hike to Marshall Lake is 1,145 feet (349m).