Head up towards Pitt Lake and on the last right turn before the boat launch there are some sloughs around with lots of bass in them. You will see a white gate walk past it and explore. Technically; a Marsh isn't classified as a lake, river or slough.
Map
Map of Pitt-Addington Marsh
Start:
Directions to Pitt-Addington Marsh:
Additional Info
Notes: 1. Always check the current BC Fishing regulations before you start fishing a new spot.