The replacement bridge
Photo taken by Mark Dellbringge in August 2010
Hi JT, you may have been referring to another bridge further out west on Arsenal. That bridge was built in 1996 to replace an earlier viaduct. It is located between Jamieson Ave. and McCausland Ave. It crosses the BNSF RR yard and River Des Peres drainage channel.
I remember the old bridge had brick handrailings and, at the end of the bridge, had a sharp left turn for westbound Arssenal motorists. The new bridge is nice and straight.
I think this bridge may be over the BNSF tracks. Arsenal Street doesn't go over the UP tracks as it ends before it would cross.
The now lost Arsenal Street UPRR bridge was built similar to the Columbia Avenue bridge about 1/4 mile to the north. The Arsenal bridge had the same balustrade design as the Columbia Ave. bridge but it also had a hump in the middle.