Thanks for posting the page from the ODFW website. That’s very helpful.
However, you made the same mistake I did. As I read it now, an out-of-State Washington license is NOT a valid Oregon license. So it cannot be used by Oregon residents when fishing the Columbia River (downstream of the Tri-Cities, including B-10). Note that the first sentence says nothing about out-of-State anglers. It only covers resident anglers with resident licenses. The second sentence covers ALL anglers (including Oregon residents), with one exception: Washington residents. So Oregon residents must have a valid Oregon license when fishing B-10, regardless of where you launch.
So , as I interpret the regs, if an Oregon or Washington resident is boarded by a game warden while fishing B-10, they MUST have a valid license from the State in which they reside. (BTW, this has happened to me three times.). Again it may be cheaper for an Oregon resident to buy an out-of-State Washington license when fishing B-10, but if it’s not a valid Oregon license, they may be fishing without a license.
Also, on a related note….. I’m a Washington resident. The reg also means that I cannot cast for surf perch or dig clams at Cannon Beach with my Washington resident license, even though Cannon Beach is north of Cape Falcon, and south of Leadbetter Point. But I can bring home a limit of 12 crab or any other species of fish, provided I’m fishing from a boat. Go figure…….