Cottonwood Cove Upper Campground is closed due to flood study.

https://www.nps.gov/lake/learn/news/cottonwood-cove-upper-campground-closed-to-overnight-camping.htm

Cottonwood Cove Lower Campground is open, and a full review has been provided:

Cottonwood Cove Lower Campground, near Lake Mohave, NV

https://thedyrt.com/camping/nevada/cottonwood-cove-lower-campgrounds/review/17016