The last two overpasses, as part of the Interstate reconstruction project through Rock County, are scheduled to be removed this week.  The Department of Transportation says crews will be removing the old I43/Hwy 81 structures over I39/90.  As a result, sections of I39/90 and I43 near the Beloit Interchange will be closed overnight Wednesday and Thursday.  Interstate traffic will use the current interchange ramps at Exit 185 to bypass the closure.  The bridges were originally built in 1959.