The maps are out-of-date

We visited Thayer Glacier on North Sister on August 12, 2020. This glacier has been listed on official U.S. maps since before World War II and as recently as the 2016 by the U.S. Forest Service. Upon inspection, we conclude that Thayer Glacier is gone. There is some multi-year snow higher up in the cirque and rock fall has buried some old glacial ice near the toe of the former glacier, but active, moving ice is gone.