That lake bed is dry ALL THE TIME, esp this time of year. It might get a little moist in rainy season but... when is that? There are well worn roads across it - you can see them on Google maps satellite view - and there are signs all over it pointing you to Canon de Guadalupe, even signs in English that say "hot springs." And it's super nice - grippy soil, not thick and dusty like the road. When I had gone to Canyon de Guadalupe the first time 10 years ago, it was in a friend's 4x4 truck so we had NO problems flying along. Took the lakebed on the way out. My trip in February - we went in on the road and I regretted it. I thought it would be "interesting" for my riding companion and after going out on the lakebed, we spent a LOT of time riding around on the lakebed. We went all the way to Tecate on the lakebed!