Are you saying that there were, ant the time of creation, easements to the tens of thousands of square plots of land across the western USA? If so, what happened to them?

If this vast area of land was laid out as a grid of land and there are millions of acres of public plots inaccessible, wouldn’t it follow that there is a similar issue with private plots?

I’m sure a lot of this has been solved overtime with easements for roads, but when it was originally laid out I’d think that the vast majority of plots were not legally accessible as you’d have to cross over someone else’s plot to get there.