The new bridge carries US 81 over the Missouri River into downtown Yankton, South Dakota. The $24M project was opened in the fall of 2008 ahead of schedule. The 1500 foot long bridge is a 6 span structure with a maximum span of 280 feet. The superstructure spans were supported by haunched steel plate girders. The aesthetic open column bents were founded on drilled shafts. The outer columns were extended above the bridge deck surface with decorative precast towers. The bridge carries two lanes of SB and NB traffic separated by a painted center median. The project was constructed on a new alignment and included phased grading and paving work on both ends of the bridge. The new bridge, named the Discovery Bridge, is located 1000 feet upstream from the old double decker lift span thru truss bridge that was later converted into a pedestrian bridge. HDR performed the inspection of the existing bridge and designed and oversaw the rehabilitation under a separate contract for the South Dakota Department of Transportation. Previously, HDR had performed the corridor study, Environmental Impact Statement and the preliminary bridge design.
Completed Time: October 2008
Project's Value: $24M
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