Blanca Lake is located in the Henry M. Jackson Wilderness Area in the Cascade Mountains of the U.S. state of Washington. Blanca Lake sits in a basin surrounded by the peaks of Monte Cristo, Kyes, and Columbia. The lake is fed by the Columbia Glacier to the northwest and is drained by Troublesome Creek, a tributary of the North Fork Skykomish River. The glacier's cold, silt-filled melt water is what makes the lake a spectacular turquoise green color making this a prime example of a Rock flour lake.