NORTH CASCADES NATIONAL PARK WASHINGTON // The highly glaciated mountains of the North Cascades Range exhibit a spectacular and complex geologic history. Between the river valleys and high peaks there are eight diverse life zones with 75 mammal and 1,600 vascular plant species. Popular hiking and climbing areas of the Stephen Mather Wilderness include Cascade Pass, Mount Shuksan, Mount Triumph, and Eldorado Peak. Ross Lake and Lake Chelan National Recreation Areas adjoin the two segments of the park and are all administered together.