Fremont Ship Canal.
They can frequently be seen in a pose drying their wings, since their feathers are not "water proof" like many water birds. They search for and prey upon fish. The Ship Canal, of course is the major route for salmonids entering or exiting Lake Washington to Puget Sound.
ph credit - Michael Oxman
Arborist Michael Oxman captured this shot of one of these magnificent birds there last year.