I have been to Lake Cumberland a couple of times for their poker run in the fall. Trust me there are some pretty loud boats that show up for this, last year we had over two hundred boats, most running over 90mph, many over 100, a few approaching 150. There was never any discussion of noise laws.
Try and contact Jamestown marina or the Lake Cumberland state park, I am sure they both have websites with contact info.
The attached is from last year's run. I have a 27 Formula with a 500EFI and striaght through exhaust, no problem. And I was one of the quieter ones.