User blog comment:Stormwell/Dunwall Locations/@comment-217.122.254.24-20140131171444/@comment-3525200-20140201002800

It's widely believe that Slaughterhouse Row is located just past Rudshore/Flooded District at the Wrenhaven's mouth, this has been confirmed by ingame research.

Drapers Ward is probably located upriver, maybe on the other side of Dunwall. Given that Rothwild's Slaughterhouse going up would create a big bang smoke and the explosion being heard for miles around is plausible.