I watched eBird alerts of this bird come across my desk for a few days before I got off my butt to look for it. What I found from talking with the bird watchers during my nearly 3 hours on site was that most were unaware of OBOL.
I was lucky enough to make the acquaintance of one gentlemen who'd told me that he'd been watching birds for the better part of 60 years and he didn't understand all the fuss I was making to try and get him into position to see the Black-and-White which he was already very familiar with! He spoke with great energy about his two tours of duty in the Coast Guard patrolling Antartica in the late 50's early 60's.
The bottom line is that I dismissed the eBird reports of this bird principally because I did not recognize the names of the first observers, and I therefore concluded that they were most certainly mistaken about this ID. Shame on me!
Having said that, I gratefully acknowledge the fact that had it not been for the presence of a well known, respected, bird guide from n.e. Oregon, I would have never gotten on this bird in the first place. After he and his mom left, I was the expert so long as I was standing there by myself :-) So there you go!
This is a great bird for Clackamas County, Oregon in Winter, Spring, Summer, or Fall. Go find this bird if you can. At best, you'll likely meet a bunch of wonderful people happy to share their knowledge with you. At worst - you'll find this bird, check it off your list, and then move on.
Zoom-in (all the way) to get the exact location of a reliable point to find the warbler, that is, if you're patient.
According to my study; (read no prior contact with this species in the field) its pale lores and buff-colored flanks suggest this is a first year female. But I was wrong - see the comments at the end of this post for a detailed explanation.
OTHER BIRDS AND SUCH
A nice look (for me at least) of a member of the Myrtle population of Yellow-rumped Warbler:
A Sharp-shinned Hawk which flew in and killed the party for about 20 minutes:
(the one that got away)
I found this the most reliable spot to locate the Black-and-White Warbler: