That makes sense. Thanks.
Ben, you might take a second look at the data you posted for this bridge. It seems to me, based on the photo, that the data is for the NEW bridge rather then the historical bridge. The new bridge is likely a Bailey Truss bridge installed in 1988 right next to the old through truss bridge.
Craig,
Your assessment is correct, the posting is drawing on NBI date for a Bailey pony truss at this location, not the through truss. The through truss at this location dates to 1912. Its quite a nice looking bridge.