Maryhill State Park is a 99-acre camping park with 4,700 feet of waterfront on the Columbia River in Klickitat County, Washington. The park includes camping areas for tents, groups, and RVs, as well as a large day-use area with a boat launching area and swimming beach. There is lots of space for picnicking.
We camped at this campground in mid-April. Note: this is not a quiet, wilderness campground—there is noise from the trains (there are tracks adjacent to the park as well as across the river) and traffic (the interstate is across the river and a major highway runs next to the park).