A couple of years or so ago we were cruising a section of the BCN and decided, after looking at a map of the BCN, to go up the Ridgacre branch for a short way and then turn at a winding hole part way along. Big mistake. We got caught in the reeds and it took a couple of friendly natives using our ropes, myself using the pole and my wife on the tiller to get us back to the branch entrance. The water was absolutely foul from polution. Would hate to have fallen in!
Wikipedia has an interesting article on the Ridgacre Branch:
http://en.wikipedia.org/wiki/Ridgacre_Branch
Stewey