From the YNP Facebook page:
😞 Yosemite's High Sierra Camps will not open this year due to above-average snowpack, lack of access to water for bathrooms and kitchens, and other infrastructure challenges. Tuolumne Meadows Lodge and White Wolf will open (it's too early to predict when; dates will depend on when Tioga Road opens). If you had a reservation at one of the High Sierra Camps, you will be contacted directly.