According to the Bureau of Land Management website, “The South Cow Mountain OHV Management Area is temporarily closed due to heavy precipitation and poor road and trail conditions. For more information, call (707) 468-4000.”
The BLM website provides the conditions that must be met to close the area to the public:
To protect roads and trails from damage, South Cow Mountain is closed during periods of precipitation. Temporary closures begin when: 1) precipitation exceeds 4 inches at the beginning of the rainy season (typically November); and 2) precipitation falls 1/2 inch within 24 hours, or 1 inch within 72 hours. Typically, South Cow Mountain will reopen after 72 hours of no precipitation.
To determine whether South Cow Mountain is open, please contact the Ukiah Field Office at (707) 468-4000.