Right off I-5 so if traffic noise bothers you this may not be the place for you. Lower part of D loop tends to be buffered by the hill and sites in E loop. The road for the sites in C loop is a bit small but can be managed.
This is a reservation only state park but you can make the reservations day of before getting there. A loop is now Yurts and group camping.

We were here over Labor Day weekend and although full, the campgound was quiet except for occasional traffic noise, mainly big rigs or loud groups of motorcyclist.