An average of 26,300 vehicles per day drive across the small bridge on Main Street in East Peoria that crosses over Farm Creek. Those six lanes of traffic cross one of 166 bridges in the Tri-County Area that are “structurally deficient,” according to the Illinois Department of Transportation. A bridge is considered structurally deficient if one of its main components is in poor condition and repairs are needed. Components include the deck, the part of the bridge people drive on; the superstructure, which supports the deck; or the substructure, the foundation of the bridge. Even if a bridge is classified...