Lake Chelan has a recording on a historical marker overlooking the lower lake that states the lake is just under 2,000 feet deep with mountain peeks up to 9,000 feet high. here is info on the about the lake.
Upper Lake Chelan, Stehekin, Holden Village & The North Cascades National Park
Where No Roads
can take you...
A trip to the head of Lake Chelan is a journey into an unspoiled frontier, forgotten by time. Nestled in the deepest gorge in North America, Lake Chelan is one of Washington's largest bodies of fresh water.
Though the average width is less than two miles, the lake extends 55 miles into the heart of the Cascade Mountain Range with peaks that exceed 9,000 feet. A trip uplake bridges the gap between the arid desert-like climate of the lower Lake Chelan Valley, through fiord-like gorges carved by glaciation, to the headwaters of the lake deep in the Cascade Mountains. Along the way, you will lay witness to some of Mother Nature's finest work, though she certainly didn't spend much time polishing up. She left behind some of the roughest mountain peaks anywhere in the world