Elkmont is a massive campground, one of the better ones I've seen in a National Park. We spent 2 nights in B11, it's on the corner of a section, at the bottom of a hill, only has 1 immediate neighbor, which is above you. Good canopy coverage and a little stream runs next to it. Driveway is slanted down to the site.

Elevated tent pad was large enough for our huge tent (BA Tensleep Station 6). Water and toilets are nearby.