You can look into a private campground or a state campground.
Some parts of the government we are told have been partially shut down for almost two weeks. You did not notice until a small part of it may effect you. The good news is that you do not need to change your plans for the weekend that you stated. The campground will be opened eventually. Have fun on your trip.
2013 Forest River Salem Hemisphere SBT312QBUD
2001 CrewCab F-250 7.3 PowerStroke Diesel
SuperChip, BTS transmission, 6.0 Trans Cooler