Any of the creek mouths is a great place to start
as in all rivers in Alberta
last part of April and the first part of May
Pre spawn n spawning Rainbows will congregate in rivers where the creeks run in
when the temperature of creeks and it rises they will move into creeks
lots of ice in creeks yet
with the Rainbows will be the other fish of the rivers
Bull Trout /Mountain Whitefish /Grayling /Burbot/Brook Trout /Lake Whitefish/Pike/Walleye/even Perch
Google Earth is a good start when looking how to get close too these creek mouths
I will use Alberta Parks map then go where ever I want to look
http://www.albertaparks.ca/william-a-switzer.aspx
if your an avid Angler then walking the whole river or as much as you can
lots of anglers get mad at me for giving out info .. but at least I don't charge like a guides does.. lmao
Good luck with your quest
David