Tire chains or 4-wheel-drive with snow tires required on Hwy 140, roads within Yosemite Valley, Hwy 41, and Big Oak Flat Road including Hwy 120 west of Crane Flat. The Hetch Hetchy Road is temporarily closed due to snow and icy conditions. Road conditions can change at any time. For the most up to date road information please call 209 372-0200, press 1, then 1.