Vancouver Kayak Club is probably your best bet for a club and local beta. There is a BC page here on PP as well under the rivers tab. The river pages for BC aren't filled in very well compared to the Washington pages, but there is some good info. AW has some info on their river pages too.
The main site for getting level info for Canadian rivers is:
http://wateroffice.ec.gc.ca/index_e.htmlGood time for a reminder: PP folks: everyone is encouraged to help us Rio Banditos by adding to river descriptions, not just for WA rivers, but all states & Canada too!