You're able to get up close to some them (several feet), but you're not allowed to go inside the ruins themselves.  I try to get some more pictures from the lookout points on top of the canyon.  If you want to see what a flood can do, go to flickr.com and type in "Stuck Truck, Canyon de Chelly".  It is an ex-military 2 1/2 ton truck used by one of the local tour company.