Sullivan County, Ind. – The Indiana Department of Transportation announces closure of State Road 54 for box culvert replacement. The closure of SR 54 will begin on or around June 2. Crews will be replacing a box culvert. Replacement is expected to take 30 days to complete. SR 54 is expected to re-open around the beginning of July. An official detour for motorists is US 41 to State Road 48 to State Road 59.