No  reservation campground. I came on a Wednesday the last week of September and took the last site which happened to be the handicap site that become available at 3:00 because it was not yet taken. However, this situation only allows for a one night stay which was fine for me since I just needed a place to crash that night. Had I wanted to stay longer, I could have easily jumped over to other sites that became available in the morning. This campground cleared quickly in the morning and there did not appear to be many multi night guests but rather people needing a place before or after traveling the Tioga Pass.  Arrive early (before 9AM) and you will probably get a site. 

Some road noise but beautiful big sky at night.

Pit toilets

No cellular service