Restoring a Historic Double-Deck Swing Bridge


One of only two remaining historic double-deck swing bridges in Minnesota that carried railroad over roadway faced demolition due to deterioration and neglect. But the City wanted to preserve the bridge as a regional trail feature overlooking the Mississippi River.


Following a demolition moratorium signed by Minnesota’s governor, the SEH project team designed a 670-foot recreational bridge that incorporated many of the steel components of the original bridge, built in 1894.


  • Bridge reuse study determined preferred concept for converting a vacated railroad/roadway bridge to a pedestrian pier
  • Restored 670-foot truss bridge/pedestrian pier on the Mississippi River
  • Preserved historic elements of the original truss
  • Stimulus-funded (TE ARRA) project on short delivery schedule
  • National Environmental Policy Act documentation
  • Agency Coordination


  • 2011 Honor Award | American Council of Engineering Companies
  • 2011 Merit Award | Minnesota Society of Professional Engineers

Rock Island Swing Bridge

Inver Grove Heights, Minn.

City of Inver Grove Heights, Minnesota


  • Bridge Assessment
  • Bridge Design
  • Construction Administration