Thanks to Paul for doing the ground work on these maps...
Just out of curiosity, I over-layed a map of ownership for land in Clatsop County. Most of the County is privately owned by private timber interests and is behind locked gates. Most of the non-birded areas correspond closely with private timber properties.
We can get into some of these areas if we commit to a long hike or know someone with a key, but they are, for the most part, tracts of inaccessible clearcut forest which calls such efforts into question.
There are, of course, many unbirded areas in Oregon that are not visited because they are out of the way or lack the reputation of a place like Malheur or Boiler Bay or the South Jetty, but much of Oregon is also unreachable.
I guess the trick, here, is to sort out the forlorned from the forbidding.