The black primaries and plain white head have got me thinking western gull but totally ready to go with Olympic gull if I’m missing something. Sorry about the quantity of photos - trying to make up for poor quality cell phone photos by having an abundance!
Only picture I got before it disappeared. Better views through binoculars. Continuing juvenile bird, has been here for months. Note light back with scalloping, light head, and you can just see the tip of the ivory, upturned beak. Compare with https://www.inaturalist.org/observations/205176383 seen the day before.
Tricky as it was moulting but I am seeing a thing dagger-like bill which makes me think eared?