The Iowa Department of Transportation says the bridge on Iowa Highway 9 was closed immediately on Wednesday after the crack was discovered during a regular inspection.
The department says it doesn't know how long the bridge will be closed.
Traffic is being rerouted. The nearest bridges over the
Mississippi River are about 30 miles north and south of Lansing -at La Crosse, Wis. and at Prairie de Chien, Wis.
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