Basic Nice Smaller Campground at Cascade Locks
Smallish campground (15 or so spots) on a small "cliff" overlooking Cascade Locks. Spots are close together, surrounded by grass, with a small bathroom in the center of the lot. Tents are $25 per night, with several sites also available for a bit more for RVs with power and water. Reservations ($10 fee) are only accepted during the summer.
There's not much to do at all in the small campground, but there's a decent amount of places to explore right in the same area. Across a small street there's a playground, the Locks themselves, views of the Columbia River and even a museum.
Nice enough campground if you want to stay in the area for other activities, though no privacy at all between sites.
Month of VisitMay