Nice Washington Department of Fish and Wildlife campground with a dirt boat ramp, seems to serve mostly fishermen. Some sites are right next to the Klickitat River. Some have easy access for larger rigs and space for boat trailers. The campground is right next to SR 142, but it's not really a very busy highway. The Klickitat Trail for mountain biking and hiking is nearby.
We stayed for two nights mid-week in September. The river sites are in sight of each other but not too tightly packed. It did seem that some of those sites were occupied by some long-term residents, although you're not supposed to occupy spots for more than 14 days out of 30. One site ran their generator constantly, so we set up on the other side of the old Icehouse structure right next to the river, where the river noise covered up the generator noise. We had a quiet pleasant stay.