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.
Blanca Lake is accessible only by foot, along the Blanca Lake Trail. The trail begins at 1,900 ft. The trail climbs quickly from switchback to switchback, gaining 2,700 ft elevation over 3 mi, finally arriving at the top of a ridge.
Wikipedia https://en.wikipedia.org/wiki/Blanca_Lake
Coordinates 47°56'26.098" N -121°20'28.02" E