UPDATE May 6, 2021 : SR-108/Sonora Pass Will Open at Noon Today UPDATE May 6, 2021 Caltrans District 10 announced this morning that SR-108/Sonora Pass will OPEN today, May 6th, at noon.ย Last year Sonora Pass opened on May 15, 2020. Caltrans District 10 manages three trans-Sierra passes in the central Sierra that are closed during winter and generally open in spring: Ebbetts Pass/SR-4 in Alpine County, Sonora Pass/SR-108 (Tuolumne County), and […] Mike Bartholow | May 6, 2021 6 Comments