Chestnut-sided Warbler (Dendroica pennsylvanica)
Number of individuals, sex, age, plumage:  1; HY, prob female
Locality:  Wireless Rd near Astoria, Clatsop Co. 
Dates:  Sep 17, 2005
Time of Day: between ~09:30 
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 30 meters
Duration of observation: about 1 minute
Habitat:  Came out of mixed Oregon Crabapple and blackberry, then flew into Red Alders.
Behavior: it apeared from a dense thicket of crabapple and blackberry when I pished.  It perched on an open branch and acted aggitated (like most species responding to pishing) then flew up into an alder, gave a couple aggitated twitches and disappeared into the canopy.
Description: 
Overall: I was immediately struck by the bright yellow/green cap, white eye-ring and whitish gray throat. 
Head: Crown a very unique yellowish-green coming down to the eye; complete, white eye-ring; face ashy-white; chin and throat slightly paler ashy-white
Back: Green with less yellow than crown
Wings: coverts greenish, two prominent, white wing bars
Breast: Ashy-white
Belly and undertail coverts: whitish.
Tail: Dark with white corners
Voice: I heard a flat chip note several times from the place where the bird appeared which was presumably this bird.

Similar Species:

All the green and gray initially brought to mind Nashville Warbler which does not have a green crown, wingbars or white tail corners.  All other superficially similar Vermivora and Oporornis can be eliminated by the same criteria.
There are no other Dendroica that match this discription
Previous experience:  I have seen adult Chestnut-sided Warbler at Malheur.