Start planning your road trip along the Colorado River Headwaters Byway.Sprague Lake in Grand Lake, Colorado, the starting point for the Colorado River Headwaters Scenic Byway.Credit: marcoisler/Getty ImagesKey PointsThe Colorado River Headwaters Byway is an 80-mile National Scenic Byway that winds through mountain towns, passing alpine lakes, hot springs, and canyon overlooks.Travelers can enjoy fishing, boating, rafting, and relaxing soaks alo…