>From the ABA Website:

Rule 1: The bird must have been within the prescribed area and time
period when encountered:=20

A. Within means that the bird must be within the prescribed area when
observed, although the observer need not be. For example, if an observer
on the U.S. side of the Rio Grande identifies a bird across the river on
the Mexican side, the bird may be counted on his Mexican list but not on
his ABA Area list.=20 B. Prescribed area and time period are defined for
the particular list:=20
(i) ABA Checklist Area is defined in the current ABA Checklist as the 49
continental United States, Canada, the French islands of St. Pierre et
Miquelon, and adjacent waters to a distance of 200 miles from land or
half the distance to a neigh boring country, whichever is less. Excluded
by these boundaries are the Bahamas, Hawaii, and Greenland.=20
(ii) A subarea of the ABA Checklist Area, or other prescribed area, is
as defined by its legal boundaries. If not legally defined otherwise, it
includes adjacent waters (rivers, lakes, bays, sounds, etc.) out to half
the distance to a neighboring area, but not beyond 200 miles.=20
(iii) Birds observed on or over an ocean are counted for the area having
jurisdiction over the nearest land, if within 200 miles.=20

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I read this as saying that the bird is a Washington bird, if you are
observing from Oregon. (I have a Mexico list despite the fact that I
haven't been there since I started keeping a list, due to the scenario
mentioned in part A.)

Robert Manning
Austin, TX