That's the right size boat and $15 is cheap. Hope you have a good float and find a few fish. Those runs are definitely harboring some springers and summers right now. I'd like to know how it goes if you feel like posting it? Good luck!
Wish I could help. Grant is the only shuttle I know of. Might want to talk to Mark's snack and tackle in Troutdale and see if they know of an alternative.
You're running kayaks through those sections, yes?