I just called the Forest Headquarters Office and two ranngers. No humans. The recording states that the San Bernardino National Forest is closed for all uses, and the closure will be reevaluated daily.
At this link, the USDA Forest Service shows Cleghhorn Ridge OHV Road 2NN47 status "CLOSED".
https://www.fs.usda.gov/recarea/sbnf/recarea/?recid=74101
https://www.fs.usda.gov/detail/sbnf/news-events/?cid=FSEPRD799192