Just got an email from Recreation.gov for Horseshoe Meadows tomorrow:
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This is an update related to your Recreation.gov reservation at Inyo National Forest - Wilderness Permits. The dates affected are 6/18/2021 - 6/19/2021.

You are receiving this email at the request of local facility managers. We wanted you to be aware that a wildfire affects your reservation; please do not visit this location until it is deemed safe. Follow-up communications will be distributed as soon as local managers are able provide additional details. Please continue to monitor this location’s facility page on Recreation.gov for status updates or visit the agency’s website for details. Keep in mind, local personnel may be attending to this urgent situation and not available to provide updates immediately. Please be patient as conditions are assessed and closures are implemented.

This is for Horseshoe Meadows but I wouldn't be surprised if they do the same for Whitney Portal...