Don't say they didn't give you any warning. Not that will make you feel any better if you get held up on your way up to the portal area.
“There is no way to complete this project without having a significant impact on visitors to the Whitney Portal area,” said Ed Armenta, Forest Supervisor. “The road has only one ingress/egress and the already limited parking will be much reduced. Accessing the area may be, at times, difficult and frustrating. Your planning and patience will help complete this very important project.”
LINK: http://yubanet.com/regional/Whitney-Portal-Road-Reconstruction-Planned-for-2016.php