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St. John the Baptist Parish
Old Pass Manchac Bridge [Map · Street View] Steel stringer bridge over Pass Manchac on Old US 51Open to trafficThis bridge was built in 1957 originally carrying US Highway 51 across Pass Manchac, replacing a timber bridge with steel draw span that opened in 1927. In 1979, Interstate 55 was completed and US-51 was co-signed with I-55.