On the Nevada State Parks website, it says this:
Which parks provide hook-ups?
Hook-ups are available at Cathedral Gorge, Valley of Fire, Echo Canyon and Big Bend of the Colorado State Parks. Plans are to also install hook-ups at Washoe Lake, Spring Valley, South Fork, Kershaw-Ryan, and Ward Charcoal Ovens.
There is a webpage for the park
http://parks.nv.gov/parks/ward-charcoal-ovensHERE.