Looks like some serious fun,I always thought the salt was dry?

I thought so too, seems the water level is just below the surface, there are soft patches where you can break through and get stuck in a salt/mud mess.

In the wet season, if you can call it that, there is a half inch of water over most of the surface. 

I am still finding patches of dried salt on the bike, not a good idea to ride it when wet.