Entering Auke Bay, 14 miles north of Juneau. There is extreme, ongoing geological uplift in southern Alaska. As the glaciers and ice fields above melt, the ground is rising about ½" per year.
Because of this glacial rebound, the waterway between the north end of the Gastineau Channel (on which Juneau sits) and the Stephens Passage is slowly disappearing; it's no longer navigable except at high tide and only to small boats. Cruise ships to Juneau enter and exit through the lengthy Gastineau Channel. Ferries use the more efficient Auke Bay site as their terminal.