This "one-of-a-kind" spiral bridge crossing the Mississippi River at Hastings, Minnesota was built in 1895. The bridge was designed with a spiral ramp so that it was high enough for steamboats to pass under it while still exiting at the main business district of Hastings.
The spiral bridge was destroyed after a replacement bridge was built in 1951. That bridge in turn is in the process of being replaced.
Yikes, I wouldn't want to drive on tat. I wonder if there were a lot of accidents.
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