You can check online. https://washington.goingtocamp.com/ but I'm going to guess no.
The online only list part they have sites available that aren't reserved or you can get split sites but that means you stay one and then move to another because they don't have a sit for the days you want at the time but they have two or three different sites available in those days you can do reservations online and split the sites to the days you want if they don't have 1 site to fit those exact days . Hope that helps
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