Bridge closures for both vehicular and pedestrian traffic are coming on Tuesday and Thursday this week. The Lakeshore Road Bridge in St. Catharines will be shut from 9 a.m. to noon on Tuesday, while the Allanburg Bridge in Thorold will shut from 9 a.m. to 4 p.m. on Thursday. The St. Lawrence Seaway Management Corp. says that both closures are for maintenance.