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facebook group. Quite a lot of information and trip reports of people who do long distance paddling on the Missouri plus other info on the Yellowstone. A good source of contacts. Jefferson River Canoe Trail group might also yield some paddling contacts for you.
Gerald I sent you a e/mail don't know if you got it. If you did not get it let me Know.
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I am a kayaker from Missoula. I do a lot of multi-day kayak trips, mostly whitewater, and including a lot of trips in the 1-2 week range. When I retire in a couple of years, I want to do longer trips,. Send me a personal message with your contact information, so we can discuss our respective interests.