PA 21

Masontown Bridge (Fayette County, Pennsylvania)
Built 1925; rehabilitated 1993
Lost through truss bridge over the Monogahela River on PA 21 in Masontown
Replaced by a new bridge

North Fork Wheeling Creek Bridge (Greene County, Pennsylvania)
Built 1930
Concrete arch bridge over North Fork Wheeling Creek on PA 21
Open to traffic

South Fork Wheeling Creek Bridge (Greene County, Pennsylvania)
Built 1930
Concrete arch bridge over South Fork Wheeling Creek on PA 21
Open to traffic