Oh the irony of Google's doodle today
Celebrating the 123rd Anniversary of Yosemite National Park on the day it is shut down.
Edit - I should qualify that: there's no real way of knowing how long it will be shut down. These shutdowns don't happen all that frequently, but there was one during the Clinton administration that lasted 21 days. That's the longest, I believe. A contingency plan on your part might not hurt, depending on when your trip is scheduled for.