it looks like Frank Church has a diameter of about 25 roadless miles centered around the Cabin Creek Airstrip
It looks to me like you could draw a circle of 16 mile
radius around the Cabin Creek area without hitting a road. There's another spot around Chamberlain Ridge that looks similarly remote, about 16 miles. If someone has an idea of anywhere else in the Frank that's deeper, I'd love to look at it.
These numbers are pretty well in accord with some 15-16 mile figures I've seen in a couple other web sources. The 60 mile figure from Wild Idaho cannot possibly be correct, or even close. All those indentations in the wilderness boundary that look like cherry-stemmed roads are indeed roads.
Also, it's worth pointing out again that the Frank has airstrips, which I'd say does factor into evaluations of remoteness. I love the Frank, it's one of my very favorite places and I like it better than the Yellowstone vicinity. But that Teton-Washakie area has no airstrips plus grizzlies, and that definitely makes a difference.
This could make a good SP project. If we could get some members to help compile stats for each state, it would make things easier.
Yes, indeed! I'd be happy to spend a little time investigating, but I'm not sure if I'd be genuinely useful without GIS software.