 The route turns north onto Walnut Street and passes more businesses before running past a few homes a short distance to the west of Slatington Airport.PA 873 leaves Slatington for Washington Township again and runs through wooded areas with some residences.The route turns northeast, with the Appalachian Trail joining the road, and crosses the Lehigh River into Lehigh Township in Northampton County, where it passes over Norfolk Southern's Lehigh Line before ending at PA 248 at the base of Blue Mountain south of Lehigh Gap.