Snowbank itself can be good but it's a BIG lake and winds there are not kind. If you want fish, find moving water like Jordan & Cattyman area and then into Ima if you want. Plenty of trip reports here for that area as well as Disappointment and other areas in between the EP and Ima.
Disappointment Lake is excellent fishing. A lot of people paddle past some great fishing on that lake trying to get deeper into the BWCA (Ima, Thomas, Fraser, etc). That's fine but I catch lots of fish on Disappointment while watching others traveling - just saying!
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