The Leo Frigo Memorial Bridge on Interstate 43 in Green Bay, Wis., is closed indefinitely after a pier settled early on Sept. 25, causing a more than 20-in. sag across the four-lane roadway.

State and federal structural and geotechnical experts have been joined by consultants from Michael Baker Jr. Inc. and Wiss, Janney, Elstner Associates Inc. to examine the bridge and develop a plan of action.