Summer Camping Update
Both the North and South campground are fully reserve-able. No 1st come 1st-served sites are available. Reservations are necessary for weekends or any stay of more than one night. To make a reservation go to washington.goingtocamp.com. Utility sites and trailer dump are open in the North Park. RV and trailer combinations greater than 32' are prohibited in the South Park.
Original source can be found here.