from Pullman your best bet is to hunt the central ferry area on the Snake River, if you have a small boat you can hunt deadman slough.
If your banking it there is some shore access just down past central ferry park on the whitman county side. Shallow water is very hard to find on the snake, but again there is a few spots.
This area is not what it used to be for ducks, Nov is typically decent with a mix of mallards and golden eye.