Distance: 3.0 miles round trip 
Rating: Intermediate
Trail to pristine mountain lake with great views of the Franconia Ridge.  Park at Lafayette Campground parking area off I-93 south. Trail starts at the left side of the parking lot. Follow the yellow blazed Lonesome Lake Trail. After a mile, High Cannon Trail splits to the right.  Stay on Lonesome Lake Trail, as it now becomes steep. When you get to the top, take the Cascade Brook Trail along the south side of the lake.