If you can find some side channels on the yak you can probably find some ducks. The Columbia can be good but a small boat like that you are limited to walk in spots and you have to be careful because it can get deep pretty fast, I'd say the Columbia has more opportunity. If you can scout it the day before drive up along the river and see if you can find where birds are. Then hopefully you can find a way to get a public area where you can access the water publicly, stay safe first of all