Yes, but when we went, the pressure was soooo low. It took almost 20 minutes to fill 30 gallons. It would be easier if I used my jerry cans and fill up using the water spigots all over the campground.

Yes, there is a water station you can use to fill up at the entrance as well as a dump station (fee applies for dumping).

The last time we were there (over 4 years ago) the campground has water spigots at various locations. https://cdn.recreation.gov/webphotos/facilitymaps/71548_PRCS.pdf The campground also has a dump station but I don't remember if there is potable water there.

Yes. There is potable water at the far end of the “pay” dump station. Water spigots around the campground do not have threads for a hose.