Blackpoll Warbler (Dendroica striata)
Number of individuals, sex, age, plumage:  1; HY
Locality:  Cape Disappointment, Pacific Co. WA
in the shrubbery behind campsite #223, near the Waikiki Beach Parking Lot 
Dates:  Sep 12, 2007
Time of Day: ~09:00
Reporting observers address:
               Mike Patterson
               1338 Kensington Av.
               Astoria, OR  97103
Other observers: none
Light conditions:  bright overcast
Optical equipment:  8x42 Bushnell Binoculars
Distance from bird:  less than 10 meters
Duration of observation: about 1 minute
Habitat:  Mixed willow, alder and cascara wetland
Behavior:  the bird was with a mixed feeding flock of chickadees, Warbling Vireos, and Yellow Warblers.  There was also at least one Black-throated Gray Warbler, and Orange-crowned Warbler and two Common Yellowthroats.

Description: 

Overall: Brightly marked, obviously different than common western species from the yellow throat and breast abruptly transitioning to white at the belly and the bright double wingbars.
Head: Crown greenish-gray, pale buffy-yellow supercillium, dark eyeline, greenish cheek and auriculars about the same tone as crown, nape paler than crown.  Throat yellowish.
Back: Green 
Wings: Blackish with two prominent wingbars, whitish edgings to secondaries and tertials, pale tips to the primaries.  Generally contrasting bright and dark wings
Breast: orangy-buff with wide smudgy streaks forming a vague breastband and faint blurry streaks to flanks.  
Belly and undertail coverts: bright white.
Tail: Dark with white corners
Similar Species:
Yellow-rumped Warbler: lacked yellow rump, too green above, too yellow below.
Bay-breasted Warbler: white undertail covers, details of the back and face.
Pine Warbler: details of the face, overall greeness, brightness of the wings, amount of white in tail.

I did not note the leg color.

Drawing from memory about 20 minute after observation, but before consulting a field guide.

Previous experience:  I have seen adult Blackpoll Warbler at Malheur and fall hatch-year in Clatsop Co., OR