Lake Chelan is a narrow, long
lake in
Chelan County, north-central
Washington state,
U.S. It is the largest natural lake in the state by any measure. With the completion of
Lake Chelan Dam in 1927, the elevation of the lake was raised up to . Two cities lie on the southern end of the lake, and a third town sits at the far north end, providing a gateway to the
North Cascades National Park.