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The banks on both sides of the river will still be mostly private land wont they?
Are you talking Fort Peck Reservoir? If so you'll probably want a motor on that boat. And there's plenty of BLM ground from what I've heard.
Yes, it is the Charles M Russell National Wildlife Refuge that encompasses the breaks of the Fort Peck Reservoir and is open for hunting with special rules that apply. If I remember correctly the season ends a little bit early on the Wildlife Refuge, but I can't remember for sure. The water gets pretty rough and get can get very cold and windy at the drop of a hat. Not something you will want to canoe in.From Craig Montana on the missouri river below the dam - much of the river bank is private land. I have floated about 16 miles of it while fishing and there is some nice ground - saw one nice buck, but mostly private property.