I once made a similar map at work, but for the whole USA. You can view it if you use onX Hunt - called the "Roadless" layer under "Roads Trails & Rec."
There's a link at the top of the article for that too: <a href="https://notes.secretsauce.net/notes/2017/09/25_pole-of-road-inaccessibility-of-the-contiguous-us.html" rel="nofollow">https://notes.secretsauce.net/notes/2017/09/25_pole-of-road-...
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