Last September, while we were having lunch in John Day, a guy came by and handed us some maps made just for riders. They are free but supported by the advertising printed on the perimeter. The maps show which roads are paved and which are not. There are four different map ( we only got 3 ) but in doing some recent trip planning, I was surprised that some of the more obscure, but fun roads were shown.
They are available free at the merchants that advertise on the maps but they will mail the set of 4 for just $5.00 ( probably a bit more to Canada ). Hell of a deal. You can view the maps on the web site to get an idea of what you get but they are awfully small. The paper versions unfold to about 25" x 20".