Looking for a looooong lack of pavement :thumb:

Who knows of any century-length loops or simply straight roads you can go down and back on of all gravel/dirt roads in the New Hampshire/Maine area?

Can't point to anything specifically, but perhaps keep an eye on (and contribute to, if you choose) http://gravelmap.com/. From what I hear, northern NH is not for wanting gravel/dirt roads.

Another method of e-scouting I've found helpful is the adventure moto forum ADV Rider, especially the Northeast region subforum.

Good luck!