I can definitely picture that. I alway figured they like the Palouse river and traverse out from Idaho via that. One summer I paddle-boarded down the Palouse river (I don't recommend it but it was a good adventure) and I saw more variety of wildlife in that day than the previous few months -including some elk way too close for my comfort.

Oddly enough all my moose sightings were south of Kamiak in the area around Rose Creek.