boonie:
I don't know how long since you've been there, but a couple of years ago you could skip the portages on the river after Square but will have a beaver dam pullover. The river has been backed up by a huge beaver dam (~6' high) just before Kawasachong to bushwhack around. "
Was up through there in May, the first one you could paddle through but I portaged it anyway to save the canoe a little, lots of rocks, the second one doesn't even exist anymore, and the beaver dams (there are two large ones now) both have well traveled bypasses now on the side. I got to Polly in 3 hours, wasn't too strenuous.