Hi,
This bird could be from the Portland Airport where Carole Hallet is wing-tagging birds to study their movements. I have forwarded your message on to her.

Also, the earlier accipiter post/photo is a classic juvenile Sharp-shinned Hawk.

Bud Anderson
Falcon Research Group
Box 248
Bow, WA 98232 USA
(360) 757-1911 (office)
(206) 962-7838 (cell)
bud at frg.org