http://www.blm.gov/ca/st/en/fo/ukiah/s_cow_mtn_closure_policy.html or contact Larry Ames, Park Ranger at (707) 468-4093.
BLM Announces Wet Weather Closures for Cow Mountain - BLM press release 11/20/09 [details]
South Cow Mountain OHV Recreation Area
BLM CA - Ukiah Field Office