Well, unless things have changed in the last few years this fellow is FOS..... Washington and Oregon battled for years over the boundary in the Columbia. It went to court and was deemed that the Columbia was "neutral" in it's boundary. This was because the actual boundary in some places actually went very near shore in some spots and was too hard to determine to effectively patrol. Both sides agreed (in the late 70's I believe) that as long as you were not in a backwater impoundment such as a slough or river mouth, then you were in "neutral" water.
This is why I can have a Washington license, yet still fish at the mouth of the Umatilla in Oregon. Not up IN the mouth, but definetley on the Oregon side of the river. Have been checked many times by ODFW with a washington license and could not be ticketed.

Let me know if this has changed, which I doubt, or the courts will be jammed again with people being ticketed for taking a fish on the Oregon side or vice-versa. Hell, how can one tell in that big river exactly where "middle" is.... Too open to interpretation, etc....

Regards!

MC