Steve,
Little Falls to to Brainerd has some excellent musky fishing on the Miss. A couple of my brothers are avid musky anglers and they always see fish up here (oops, I may have just lost my spot in the family tree?). Alot of the In-Fisherman video publications have been taped on these sections. The stickiest, muggiest days of August and September have proven well to them up here for some nice skies. I know a couple personal friends that frequent these sections as well. Last November put 2 fish over 50″ for a couple of them with a couple more taping in the mid to high 40’s.
You will most likely find me up there fishing smallies in that time frame as well.
Good Luck