Merced River expected to go to flood stage this week in Yosemite

This year, it also poses a later-than-normal risk of flooding in some areas. Due to hot weather this week, starting Wednesday morning and peaking early Friday morning, the Merced River in Yosemite Valley — where temperatures are forecast to hit 84 degrees Wednesday — could overflow its banks.
The river’s flood stage is 10 feet. It is expected to exceed that height shortly after midnight Wednesday, peaking at 11 feet around 2 a.m. on Friday. Such a level, while inconvenient, would not cause major flooding in Yosemite Valley.

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May 1 Sierra Nevada snowpack is biggest since 1998

The good news mostly would be that there aren't many people much along the Merced River except in Yosemite Valley and the other good news is that this particular flood stage would not create a major flooding event in Yosemite Valley. 

However, if you have a camp site reservation in Yosemite Valley you might want to check with National Park Rangers or whoever is selling you the camp space to make sure your site isn't flooded this week or next.