This is the only photograph I have found of the Liberty St. Viaduct, which was built around 1912 and demolished in 1929 to allow construction of Union Terminal.  As is made obvious by this photo, the viaduct was a rather dubious affair, and few tears were shed at its wrecking.   If the Terminal had not been built it is likely that a more substantial replacement would have been constructed since Liberty St. is a major cross-town street.  Today Liberty St. ends abruptly at the Dalton St. Post Office next to the Terminal, but a short stretch of the road still exists on the west side of the Mill Creek off of Beekman St., so it is easy to see where the viaduct once stood.