no, none of the forest service camps in the area have dumps.

No

There are several campgrounds and one of the other ones along the road that has one.

There was not when we camped there several years ago.

No. The closest is in West Yellowstone about 10 miles.

I do not recall there being one. But is has been nearly 2 years since I was there. Perhaps someone who’s been there more recently will answer.