Yes, generally, wild stocks of rainbow trout stop at the Alaska range. That's a range that cuts the state in half just south of Fairbanks. There are tons of lakes above the range that were all pike and burbot lakes, the deeper ones also have lake trout. In order to create more variety they took out the pike and burbot in some of the lakes and put in rainbows, silvers, kings and char. These lakes are all mostly on the road system with just a few within a few within a short days travel by snow mobile.
The wild rainbow waters are all still completely wild and in no need of stocking. The wild pike waters are all in great shape and in no need of stocking. The ones that were converted to cold water species are all put-and-take fisheries. They are all stocked with sterile (triploid) fish to mitigate introduction of non-native species. They are all stocked several times a year. I think there are about 100 stocked lakes in Alaska. (I can check on that)
Some people don't care for it because it's a so-called "fake" fishery but I think a thirty inch rainbow is a thirty inch rainbow no matter where you catch it. I'd love to catch one and I can do it without embarking on a huge expedition (I do still love the huge expeditions, though). I've fished over forty days this winter and caught just under 400 fish through the ice personally, (total house catch, about 700) My personal best to date, 28 inches, 7 pounds.
It's great fun.