Originally Posted by Painted Horse
Most of the USG quadrant maps are based on the surveys done in the 1970. So when you buy a paper map, You are bound to get obsolete mapping.
To a certain degree that's true: however, the latest USGS maps (or at least some of them) which you can download & view as .pdf files, have an aerial photo/satellite layer with resolution good enough to pick out individual trees.
While it's true that these have some inaccuracies as well, they're a lot better than what Google Maps (or any other on-line source I've seen) has to offer. The thing about Google &c is that they're just not interested in the non-urban world.
As for the Forest Service &c closing off roads, it's true that a number have been closed to vehicle travel, but they're still there, and good for hiking, biking, and horseback riding. There have also been new trails constructed (at least hereabouts) such as the Tahoe Rim Trail - which is about the only trail I've actually seen on Google Maps.