 Midway between McKean and Erie, PA 99 passes over Interstate 90 east of its interchange with I-79.Just south of the city limits in the Millcreek Township community of Kearsarge, PA 99 separates from I-79 and turns east at a T-intersection to access US 19, where PA 99 terminates.In 1928, the PA 99 number was first assigned to what is now Pennsylvania Route 5 along the shores of Lake Erie.