Photographer's comments: 

The dark structure you see directly in the middle is a turning bridge. (It turns 90 degrees to let boats pass on either side on the Lachine Canal.)

It has been rendered useless by Lachine Canal bridge visible in the background as well as the urban developement of the southwestern downtown part of Montreal, formely known as Griffontown.

This bridge was once controled by operators from a small control booth you might be able to spot.

If you look at the horizon closely, you will see incomming snow clouds in the distance. This was the first snow to fall on Montreal in the Winter of 2007.

Shot from the abandonned CP Rail house, on an photo outting with SeMaHa.