Welcome to Washington's Playground. A vacation at Lake Chelan promises four seasons worth of memories...deep blue water, 300 days of sunshine, world-class wineries, winter activities, gourmet restaurants, and small-town charm. The pristine 50.5 mile glacier-fed lake is 1.5 miles at its widest and 1486 ft. at its deepest point. The Lake Chelan Valley is nestled in the North Cascades National Forest.