Might be taking a chance parking that early with all those tree humping hippies living right there, but I don't think it's against any rules.
Likewise. I am sure he will call you back as soon as he can. :mrgreen:You are fine to park early and hike in before the canyon opens. No issue whatsoever. I have done it more times than I can count.
I believe you still can, but only during the rifle deer hunt and you have to hunt above Site 23.A few years back I got a permit through salt lakes water authority to drive that canyon during the rifle hunt. Don't know if you still can but it saved me a long hike up the road.