The Chaco Park people and bike shops told me Route 57(one of the northern routes into the Park) is closed and to take 7900, then 7950 into the Park and that about 5 miles of it is dirt road. Route 57 from the south was dirt road. Either way, my Trek 520 on 700x32 tires will have a difficult time. Unless I hear differently when I get to Nageezi on Route 550, I'll ride 7950 as far as my bike will get me and if and when it gets impossible, 'hitch' a ride into the Park. Chaco is just part of my Northwest NM Loop. From Chaco, I want to get to Cuba and then Jemez Springs. Keep in mind that a Trek 8000 is an excellent Mtn bike. A Trek 520 is not. But you already know that. But you do know the type of dirt roads out there and that will be helpful to me. If you think my fully loaded touring bike can do those dirt roads, I'm game for it! What's the 'best' way to get from Chaco Park to Cuba and then Jemez Springs and then down to Bernalillo.? Do I backtrack my way out of Chaco the way I came in or is there a more direct way back to Route 550? From Cuba, there's 13 mile dirt road before it hits paved Route 4 to Jemez Springs. Is that road doable by my touring bike or not? This will all be happening from mid to end of Sept. I'm hoping my 40 degree bag plus extra thermalite underwear will suffice in the northwest NM nights.