Pennsylvania Route 166 (PA 166) is a north–south state highway in Fayette County, Pennsylvania. It follows the path of the Monongahela River along the entire western border of Fayette County.
Pennsylvania Route 166 (PA 166) is a north–south state highway in Fayette County, Pennsylvania. It follows the path of the Monongahela River along the entire western border of Fayette County. (en)