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I was planning to do those as part of a day trip "loop."

That would be the way to go IF you don't exit thru the B chain?
  The hardest part of those short river portages is just loading and unloading your canoe. One trip across would be nothing.

Nice landings on the river, except for one "bank' takeout/put-in but that might be different than when I went last fall due depending on water levels?