I’ve never just canoed the river so I guess I can’t really debate that time estimate. It’s always been a float/fish trip but casting only, not stopping to really work a deeper hole or anything.
I used to live on the river along that stretch. About midway between Isanti and St. Francis.
Cambridge to St Francis is definitely a long float, Isanti to St Francis not fishing just canoeing takes me about 5-6 hours. If your going solo check out the central park in Andover. You can float solo for about 3 hours and you end up within a 5 minute walk of your vehicle since it twists and turns so much in that stretch. I have not caught many walleye that far south but definitely will get a bass or two
My soft water season ended Saturday. Landed the boat and need to give it some TLC. I fished everyday in October and boated 304 walleye. Primarily fished my 5 favorite fall spots. Strictly used a jig/minnow. Lots of nice stuff with a fair amount of smaller fish. To be clear I am a catch and release guy. I probably kept 8 fish. This is a picture of a nice one from my last day out..
Fished Thursday-Saturday this week and caught only 12 walleyes in 2½ days, half as many as I caught two weeks ago. Fishing was quite slow for me, and the walleyes were biting very light. At least this week there were some decent meal size fish as only 2 were dinks along with 3 slot fish. Caught another 26" walleye pictured, and this one weighed 5#-11oz, 1oz more than the one I caught two weeks ago. Maybe it was the same fish and added another ounce. Weather was nice today and it brought out a lot of boats as shown in the second photo. Fishing wasn't good enough to deal with this crowd so I quit early. Good luck fishing, and enjoy the fall.
Floating those sections of the Rum will take you much longer than you’ll originally think it will. Be aware of that when you plan your trip. I’m assuming the water is high right now as most rivers in MN are, so it could go a little quicker.
For example, Isanti to St. Francis will be like 10 hours without slowing down much to fish. Figure about 1 river mile per hour to be a steady pace for a fishing trip.