http://parks.state.wa.us/166/Camping-fees this Web page shows fees - depends on the type of campsite. Prices start at $12.
Check the website, they had a great online reservation system. We stayed with a motorhome and I don't remember the exact price, but I remember thinking it was a pretty good deal compared to the other options in the area
Sorry, we didn't camp there
I'm sorry I do not know. We cruised there by steamboat.
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