A rugged valley drained by Swift Run, Snyder-Middleswarth Natural Area and Tall Timbers State Forest Natural Area extend about 5 miles up the drainage. The deep valley is about 0.5 to 0.75 miles wide and continuously forested. Snyder-Middleswarth is a virgin old-growth forest dominated by White Pine and Eastern Hemlock, with Pitch Pine. Tall Timbers is a mixed forest of second-growth oak, White Pine, Eastern Hemlock, and Hard Pine. This area is within a large contiguous block of the Bald Eagle State Forest.
Directions: 5 miles west of Troxelville, between Swift Run and Bull Hollow Roads.
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Large diversity of species depend on site as a stopover during migration, with a total of 176 species recorded since 1959, including Connecticut Warbler, Mourning Warbler, American Redstart, Black-and-white Warbler, Prothonotary Warbler, Worm-eating Warbler, Golden-winged Warbler, and Nashville Warbler. Old-growth conifer forest provides significant breeding habitat for warblers. One of the few natural nesting sites in Pennsylvania for Chimney Swift.
Major threats to this area are forest insect pests, notably the Hemlock Woolly Adelgid, which is threatening to kill a large proportion of the hemlock on the site. Currently protected as a State Forest Natural Area. Management of this area will allow it to continue natural succession.