* Old Chain of Rocks Main Channel Bridge
* Old Gravois Road Meramec River Bridge at Fenton, MO (recently demolished)
* US 61-67 bridge across the Meramec River
* I-72/New Mark Twain Bridge (Mississippi River) - During the opening day
* That purple pedestrian bridge across the Ohio in the Cincinnati area
* Smithfield Street Bridge in Pittsburgh, PA
* New US 40 Missouri River Bridge at Booneville (walking/bicycle combo)
* Clark Bridge (US 67 across the Mississippi, biked across using the debris-covered bike lanes)
* Old Chain of Rocks Canal Bridge (biked across a few times, many before the new bike lane was added)
* I-44 bridge in St. Louis across the River Dispair (had the right job at the right time)
Partly Crossed* Eads Bridge
* The Old US 21 Ohio River Bridge
* The stone arch bridge across the Mississippi in Minneapolis west of the I-35W bridge
* The Poplar Street Bridge (yes the one carrying three interstates over the Mississippi - another case where one can get interesting experiences by getting the right job

Really wish I had a camera available that day.)