So what are the rules regarding motor drive vehicles in the river bed? By what connection did the meander into the river? Why is it ok to mock cagers? Seems like work your own program would apply here. Hey Red Star where are you when we need you? This thread needs an uber snarky comment. I guess low hanging fruit is not your kind of sport.
Don't know if this is still the case, but back when I did more dirt-bike riding, one would be facing hefty fines if caught riding in a wash within city limits. Even if that weren't the case, you have to admit it's still an appallingly stupid thing to do at the tail end of monsoon season. While I'm not one to mock cagers for no real reason, if you can't mock stupidity then what's left?
They probably drove from Camino de la Tierra where it goes thru the wash. It's maybe a 1/2 mile from this location.