sorry for late response. yes this is located the other side of 127. left turn only on BLM trail marker 221. this is Bob & Ward cabin, which is maintained by volunteers. very cool canyon. if you google Bob & Ward Cabin it will provide more info about this cabin
just checking out the forum and came across this question. yes many fun trails to check out and the cabin is definitely a must see. short drive across dumont dunes. OHV ok just stay on trails. We will be at Dumont for president weekend. happy to take you out there.