103.8 miles: 2 hours, 3 minutes
Seasonal route: The road is subject to closure in winter. This astounding route—comprised of forests, mountains, rocks, lakes and rivers—is a national treasure. The North Cascades Highway (SR 20) journeys through Mt. Baker-Snoqualmie National Forest, North Cascades National Park, Ross Lake National Recreation Area and Okanogan-Wenatchee National Forest.