The bird was standing on a log at about 9:15 at the half way point of the crossing. Low tide was about 11:30 am so with the outgoing tide it probably drifted east then north with the outflow from the river and Commencement Bay. Maybe an afternoon ferry coming back would be worth riding if it stayed on the same log and comes back in on the tide.
I posted a picture on the Slater Museum Facebook page.
Also Heermann's gulls have been regulars at the Tahlequah dock for several weeks. Numbers range from 5-13 along with 100's of CAGUs, BOGUs, and terns including a common tern.

Gary Shugart, Slater Museum of Natural History, University of Puget Sound, Tacoma, WA & Vashon Island