Um, no, not true.
As I drove up the east side of the Columbia River I saw a sign for Marcus Island Campground. Hmmm, what was that like? I turned in.
It was nice. And. Completely. Empty. The kind of empty that makes you wonder why? Did I miss a closed sign? Was it infested with flies? Was it the site of horrible murders? A toxic dump? Mmmmm, not that I could tell. And there was sunlight. All right! I took the best spot, of course.