The trailhead for Lost Lake Trail is at the Brothers Creek Trail
The trail starts from the eastern side of the bridge and rises gradually up to Lost Lake. At Lost Lake, the trail goes west crossing a number of creeks before ending at the Blue Gentian Lake Trail and boardwalk. The route is fairly easy to find, with the exception of a number of smaller side trails in and around Lost Lake. Just make sure that you watch for the trail markers in the trees.