Hayes Bridge is a historic wooden covered bridge in West Buffalo Township, Union County, Pennsylvania. It is a , King truss bridge, constructed in 1882, and repaired in 1957. It crosses the west or south branch of Buffalo Creek. It was listed on the National Register of Historic Places in 1980. References Covered bridges on the National Register of Historic Places in Pennsylvania Covered bridges in Union County, Pennsylvania Bridges completed in 1882 Wooden bridges in Pennsylvania Bridges in Union County, Pennsylvania National Register of Historic Places in Union County, Pennsylvania Road bridges on the National Register of Historic Places in Pennsylvania King post truss bridges in the United States