LOIS M has been used for the bridges also and it bound for Quebec in the Labrador Sea at this time. In the past, it show 2 tugs for the bridge move and this is only showing one at this time Doesn't look like a bridge move.The tug Beverly M 1 left The Cherubini dock area in Halifax (well Dartmouth) this morning and is currently destined to Montreal. So it may have nothing to do with the Lower Cherry St. bridge. Or Montreal could be an interim way point.
Screen capture from: https://www.marinetraffic.com/en/ais/home/centerx:-63.3/centery:44.6/zoom:11
View attachment 365562