Hi Greg,
Your possible Kumlien's is probably a pale 1w Herring Gull, I possibly photographed the same bird last Saturday. I would say on your photos the patterniang of the scapulars and tertials are very Herring Gull. Compare it to a 1w I photographed in 2009 here.
Cheers
Jason
Thanks Jason. Your photo looks like a good fit - first impressions are always a good guide and initially it looked like a Herring Gull but with an almost perfect Kumlein's outer wing pattern. I ended up thinking possible Kumlein's given that I would have expected such a bleached primary wing pattern to have been replicated elsewhere in the overall plumage.
In response to CB, I only heard about the Am Herring Gull when I got home. No sign of it or anything similar when I was there.