 The route then follows West Swift Run southeast to the hamlet of Swift Run, after which it reduces to two lanes and begins a curvaceous ascent of the Blue Ridge, cresting the mountain at Swift Run Gap at an elevation of , where the highway crosses the Appalachian Trail and has an intersection with the access road to the Skyline Drive, the north–south highway through Shenandoah National Park, then descending to the Virginia Piedmont.After cresting the Blue Ridge, US 33 enters Greene County and has a more gentle descent of the eastern side of the mountain, where the highway follows Swift Run to the hamlet of Lydia, then passes around the north side of Powell Mountain and meets the stream again west of Stanardsville, where the road expands to a four-lane divided highway.US 33 Business (Spotswood Trail) splits to the north to pass through the center of Stanardsville, the county seat of Greene County, while US 33 follows the Stanardsville Bypass.