Old boat launch in McMinnville at the park with all the soccer fields. Head down 3rd st, turn left just before the bridge, park on the right. Walk to launch. It was damaged years ago and had huge trees and **** in the path (used to be able to drive down to launch). Can see it from the bridge and I think they cleaned up the path but still can't drive down there. Fish it with the kids sometimes and catch quite a few smallies. Drop in a pontoon but not sure where to take out. Probably somewhere before Dayton cause there is no way to get past the old locks in Layfette (that I can remember).
Fish the Yamhill Locks park off 99W. Great spot, have even seen some salmon in there but i think its off limits to salmon. There are trails heading down river but no good for the kids to walk.
Dayton has a boat launch. Fished from the launch a few times. Caught smallies, carp and trout. Can get to the mouth where it dumps into the Willie. I hear the fishin down that stretch is great. Brushy banks and all.
Also catch TONS of crawfish at all the above locations. Have got some big buggers with just a worm on a hook. Kids love the crawdad traps (me too cause I bring them home for steelhead fishin)
Also an unemproved boat launch / park just outside of St. Paul on the Willie. Caught some bass and salmon there. Good place to start in a boat to fish some brushy fishy lookin water.
Got me a pontoon but would perfer to float from dayton to newberg? with someone who has more experience than me.