U.S.

River Bridges Pose Design Challenge, Engineer Says

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A bridge in Minneapolis that collapsed was in the midst of repairs, but had passed recent safety inspections. Minnesota officials say the bridge's concrete deck, guard rails, and lights were being repaired.

Steve Olson, an engineer who teaches bridge engineering at the University of Minnesota, tells Steve Inskeep that a river span is a more complicated bridge than most, and it may take a while to sort out what went wrong.

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