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9. North Dakota

Percentage of deficient bridges: 16.1
Number of deficient bridges: 710
Total number of bridges: 4,410

The Sorlie Memorial Bridge between Grand Forks, N.D., and East Grand Forks, Minn., takes a beating during the 1997 Red River of the North flood.

The Sorlie was built in 1929 and was placed on the National Register of Historic Places in 1999.