Hmm. The 1992 NBI has a trio of Bailey Bridges as being constructed in 1975. The more recent NBI databases have earlier dates listed, early 1900s.
http://bridgehunter.com/md/frederick/reels-mill/
http://bridgehunter.com/md/frederick/little-hunting-creek/
And of course this one.
The Leudinghaus Road Bridge in Lewis County, Washington is listed still in the recent NBI as well even though it was wiped out in a flood and replaced with … a Bailey Bridge.
Perhaps the originals were replaced with Baileys and somehow a mix up led to the previous bridges' years being applied as this example shows?
The 1909 construction date listed is incorrect. Bailey trusses were invented during World War II.
Bailey trusses are often considered temporary or semi-permanent crossings and they often use existing substructures. Some NBI entries may have been left at the date for the previous bridge for this reason. Or it may just be a typical case of NBI nonsense that defies explanation.