https://www.mercurynews.com/2023/04/25/yosemite-valley-to-close-due-to-flood-risk-from-melting-sierra-snowpack/

In the latest impact as California’s massive Sierra Nevada snowpack begins “the Big Melt,” much of Yosemite National Park will close from Friday night until at least Wednesday morning due to flood risk.

The Merced River, which flows through the middle of Yosemite Valley, is rising and is expected to peak Monday at about 2 or 3 feet above its flood stage. At that level, vehicles won’t be able to drive on Northside or Southside Drive in and out of Yosemite Valley. A warm-up this week, with temperatures expected to hit the 80s and 90s in much of California, will accelerate the melting Sierra snow.