LANSING, Iowa –  Allamakee County Sheriff Clark Mellick ordered the 1,700-foot Blackhawk Bridge over the Mississippi River at Lansing barricaded because of “some slight movement.” Structural engineers were summoned to examine whether the high catilever span is safe for trucks and automobiles. The bridge, built in 1931, is the only river crossing between LaCrosse, 38 miles upriver, and Prairie du Chien, 32 miles downriver. It’s been closed before — from 1945 to 1957 when it was damaged by ice dams. There has bend discussion fo nyears about replacing the rickety narrow-lanes bridge, which is an icon for theregion.

Black Hawk Bridge. After 90-plus years the Model A-era bridge has long been considered beyind its useful life.