Four months after you posted, but yes, Sea-to-Sky / 99 is paved its whole length. Beautiful road, too.
"How rare that we can point ourselves inevitably west and go, go, go. Run out the highway and the hills. Slide our fingertips over the creases and the valleys of the impossibility that is America. You can’t grasp its vastness from a plane. It’s diversity from a map. You have to put your feet on the ground. Your hands in the dirt." - Zach Bowman
My SmugMug galleries (copy & paste)---> https://meefzah.smugmug.com/