I have a soft spot for the Missouri River. It actually starts here in Montana and travels 2300 miles or so before it ends in St. Louis, Missouri. It doesn't get near the coverage of the other famous rivers here, the Yellowstone, the Madison, the Big Hole and many, many others. It did play a huge part in settling Montana in the late 1800s as ships brought goods, people and livestock up and down the river long before the trains were brought in.
I've seen quite a bit of this river. It supports an amazing amount of wildlife, assorted vegetation and trees, and lots of recreation. But for the most part, it stays quiet all your 'round. And that's okay with me.