Montana's rivers are liquid highways through some of the most beautiful wilderness areas on earth. And with a little creative trip planning, you can explore these watersheds from their headwaters, and down into the whitewater canyons. Our crew hiked up into Hyalite Canyon in the Gallatin National Forest, a wild landscape where snowmelt tumbles off 10,000-foot peaks. From here they floated the Gallatin River, which not only has classic class III-IV rapids for paddling but some of the best fly fishing in the US. If you're truly looking for adventure, Montana's waters are like no place else on earth.