We drove through loops E and F to check them out, looking for a place to stay for the night. All sites look the same, well maintained, kind of boring. Minimal amount of privacy between sites. Kids running around all over the place. We decided to keep moving to find something more interesting and low key and peaceful feeling, but still giving this place 5 stars because it's a nice place, it's just not our style. (We ended up at Cascade State Park, which was more what we were looking for).

You can make reservations here, or drive up and see if any sites are available for that day. We drove through here on a Thursday in late August and there were only 3 sites available for walk up. Some sites are partial hookup (electric and water) and some are non-hookup. 

There is a book exchange at check in kiosk, always a pleasant feature for us :)

There was a long line at the dump station, so maybe plan ahead for that.

Weak but usable verizon and ATT.