Upper Florence Lake is a freshwater lake located on the west skirt of Ladies Peak and Cape Horn, and North of Grindstone Mountain, in Chelan County, Washington.

The lake is a popular area for hiking, swimming, and fishing, especially for rainbow trout.

[5] Along with neighboring lakes, Lake Florence was given its name by Albert Hale Sylvester, a topographer for the United States Geological Survey working throughout the North Cascades National Park Complex around 1900.

Self-issued Alpine Lake Wilderness permit required for transit within the Sylvester Lake area and can be obtained at the Chatter Creek Trailhead and the Campground past the Guard station.

[10] This Chelan County, Washington state location article is a stub.