Tioga Pass, Sonora Pass, & Monitor Pass in California All CLOSED Due to Snow 9,943-foot Tioga Pass (hwy 120), 9,623-foot Sonora Pass (hwy 108), and 8,314-foot Monitor Pass (hwy 89) are all currently closed in northern California due to snow.ย The high country of California saw 12-24″ inches of snow in the past 24 hours and that was enough to close these mountain passes.ย They’ve all been closed since yesterday morning. There is a […] Industry News SnowBrains | November 3, 2015 0 Comments