You won't see any footprints at this lake. It might be the most pristine, unspoiled lake in the entire Rocky Mountain National Park/Indian Peak Wilderness area. This is uppper "Lost Tribe lake" below the southwest face of Iroquois Peak. The peak sees maybe an ascent or two a year, and those few that care to visit the area get the Lost Tribe Lakes as a bonus.
It's a 16 mile, 4.500-ft hike to get to these lakes.
Indian Peak Wilderness, Colorado.