Mendenhall Glacier Alaska Cruise Day 4 Mendenhall Glacier is just a few miles north of Juneau, and is the most accessible of all Alaska glaciers. It is 13 miles long and over 1500 acres. To the right is Nugget Falls. This area is part of the Tongass National Forest. Nugget Falls. Notice how small the people are who are standing next to it. The falls are about 377 high. Icebergs that broke off from the glacier float in Mendenhall Lake. Mountains surrounding Mendenhall Lake. Over many years the glacier scoured the rocks with grit and other rocks to create these lines in this large rock, even transporting rocks down the mountainside. This is a lush rainforest near Juneau, very green, with a lot of moss. An actual piece of glacier ice.