We took off from Portland around 4pm on a Friday and got to the campground around 6. Be careful with Apple Maps, I think they routed us to the historical campground and had us going about 10 miles past the site.
This was our first time camping in the Tillamook; and was cool to see the differences between it and Mt Hood. There were tons of birds, rabbits, and chipmunks at the site.
The river was super clear, with a rocky beach and some beautiful formations a bit to the west.
We were there the first weekend in September and it was remarkably empty. I think two of the sites in the K loop were occupied.
We opted for K4 which was farther from the parking lot, and closer to the river. Unfortunately, closer to the river meant closer to the highway, too. So we never really got the serenity of a site further off the path. Not a big deal, but since I live near a highway, I welcome the break when I can get it.
The other problem with K4 was that you had trails on either side of the site, so it wasn’t the most private. I think K6 might be the best spot in the loop, but you may get additional noise from the parking lot and squeaky water pump.