Kent Narrows has a nasty current to contend with. Unless you have a fair amount of engine power on your boat I would not attempt the narrows passage. It would be real easy to be swept into the draw-bridge during a hard, outgoing tide. And, when the tide is running hard, you have power your way between the draw spans at a fairly high rate of speed in order to maintain steerage. As for navigational problems, the channel is fairly wide and deep, and well marked.