Covid restrictions were tight in August of 2020 so not many of the Yellowstone campgrounds were open.  We were lucky to get a space that someone had cancelled on.  Don't give up until your last day to check for availability as there are always cancellations.  We arrived in the evening after spending a magnificent day exploring Yellowstone.  Such a treasure that has been gifted to the American people.  Campgound itself was pretty basic but the surrounding area was lovely.  Lots of nice hiking and people watching as campers enjoyed the lake and the starry sky at night.