This was a wonderfully refreshing stay in Early December. Reservations not required at this time, but are starting season on January 1st at recreation.gov. All sites were pull through and paved. This is a dry camp site, but there is access to get fresh water and there is a dump station that also has access to fill your fresh water tank.
For those interested in cellular access, I had T-Mobile LTE coming off Mexico tower. My plan includes Free Unlimited data in Mexico