Blackpoll Warbler (Dendroica striata)
Number of individuals, sex, age, plumage:  1; HY
Locality:  Circle Creek, Seaside, Clatsop Co. 
Dates:  Oct 2,2004
Time of Day: between ~12:30 
Reporting observers address:
               Mike Patterson
               1338 Kensington Av.
               Astoria, OR  97103
Other observers: I was with 4 birders who were visiting as part of the Lower Columbia Birders bird walk: Marty and Colin Skinner and two folks whose names I failed to get.  Steve Warner relocated the bird about 40 minutes later.
Light conditions:  bright overcast
Optical equipment:  8x42 Bushnell Binoculars
Distance from bird:  less than 30 meters
Duration of observation: about 1 minute
Habitat:  Mixed alder spruce wetland.
Behavior:  the bird was actively feeding in a Pacific Willow about 10m up.  It was keeping company with a Ruby-crowned Kinglet, a Yellow-rumped Warbler and a couple Black-throated Gray Warblers.

Description: 

Overall: I was trying to get folks onto a Black-throated Gray Warbler when this bird appeared in my binocular field.  I immediately recognized that it was not any common western species from the yellow throat and breast abruptly transitioning to white at the belly and the bright double wingbars.
Head: Greenish-gray, pale yellow supercillium, dark eyeline, greenish cheek and auriculars, nape paler than crown.  Throat bright lemon yellow.
Back: Green with darker streaking
Wings: Black with two prominent wingbars, whitish edgings to secondaries and tertials, pale tips to the primaries.  Basically lots of brightness to the wings.
Breast: Yellow with smudgy breastband and faint blurry streak to flanks.  Yellow transitions to rather abruptly to white at belly.
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.
Previous experience:  I have seen adult Blackpoll Warbler at Malheur. 

Additional details noted by Steve Warner:
Nearly as large as Yellow-rumped with shorter tail, pale-ish, straw colored legs.

Additional details from Colin Skinner:
Below is a description of the Blackpoll Warbler seen we saw
at Circle Creek on Oct 2, 2004 sent to me by Colin Skinner
(~16 years old) to be included in the documentation for this
bird.

>From Colin Skinner (the_Casualty@comcast.net) 

Here is the description of the bird from circle creek:
 - Roughly wren sized 
 - pale greenish yellow on upper-body with yellowish
   throat and slight streaking on the breast. 
 - two white wing bars on dark wings
 - a dark eye-line
 - white under-tail coverts
 - a dark warbler shaped bill
 - It was also flicking its tail up and down occasionally.