Roller bridge that retracted into a pocket to allow barge traffic to pass beneath. It has since been fixed in place, the pocket covered over and rails added for safety.
Facts
Overview
Steel stringer retractable roller bridge over Hennepin Canal Lock 2 on Hennpin Canal Trail
Posted January 31, 2012, by Nathan Holth (form3 [at] historicbridges [dot] org)
Wow, I was unaware of this retractile bridge, an excellent find! I am extremely disappointed to see they filled in the bay/pocket. It would have been nice to see the integrity of this nationally significant historic bridge maintained.