Yes there are coin washing machines and dryers in the building with the restrooms. I'm using one now.
The campground has indoor bathrooms located strategically about the campsites. Some people hand wash small items in the sinks.
I don't think they do if I'm not mistaken the have a restroom to change and shower heads on the side to rinse off sand I truly haven't seen washers but maybe if you rent a cabin they might.
I don't know for sure. You should call the park. They have a number listed on the parks website
I don't recall see any a few years ago.
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