Photo taken on May 4, 1912.
This bridge once carried vehicular and street car traffic over a ravine in Rock Island, IL. Photo taken on May 4, 1912.
Courtesy of the Augustana College Special Collections; Used under Fair Use
View this photo at umvphotoarchive.org
BH Photo #522505
I would call this a "Post Deck Truss" which would be an extremely rare find.