Missouri Headwaters State Park [MT]
This park encompasses the confluence of the Jefferson, Madison, and Gallatin Rivers. Lewis and Clark anticipated this important headwaters all the way up the Missouri River. An easy three-mile drive off Interstate 90 at Three Forks, this undeveloped park provides outdoor interpretive signs, picnic spots, short hiking trails, a small campground, and—just as the Corps of Discovery found—plenty of mosquitoes!
The site offers occasional recreational and educational events.