My recent (2 days ago) ride up and back down the Spiral Highway was uneventful. The pavement isn't new but there were no potholes nor anything that I saw that would have to be dodged. Was I at +30? Nope!
My riding style is not aggressive when I'm on pavement I'm not on every day. These are very rural roads I travel, many of them I've been on literally a hundred times, but you never know if a tractor has drug out a bunch of big clods or globs of mud, or if a rock has fallen onto the roadway. Deer, especially during hunting season, go straight up or down these hills and gravel or worse could now be on a curve that wasn't there 5 minutes ago.
That said - this is a really cool old grade that shouldn't be missed, IMHO!