The trail crosses under the parkway and heads northwest, crossing the Whitehouse Brook and then the Cascade Brook. The junction of the Basin Cascades Trail is just before the crossing and there is a small waterfall just south of the Basin Cascades Trail. The trail continues after crossing the Cascade Brook, which is difficult to manage in high water. The trail follows the brook until the junction of the Kinsman Pond Trail on the left, where it leaves the Cascade Brook and gently climbs to Lonesome Lake. The AMC Lonsesome Lake Hut and Fishin' Jimmy Trail are on the left after the trail ends at the lake.