There are times when something special is needed to do
all the heavy lifting. The 3,300-ton structure was lifted
55 ft into place using 900-ton strand jacks mounted to
the top of the piers. To date, this marks the heaviest bridge
move in the U.S. The unique 545-ft-long free-standing
tied-arch main span includes trapezoidal variable depth
steel box arch ribs, post-tensioned concrete tie girders and
a redundant grid steel fl oor system. Project challenges
included working in a narrow section of the Mississippi
River and dealing with winter freeze-up, spring fl oods and
navigation traffi c.
