On the way south to Natchitoches you cross Spanish Lake. Before they put levees on Red River, this area flooded in the spring and stayed wet into the summer. Today it is fertile farmland. It is a puzzle when you come out of the rolling hills to this great flat basin, and you'll often encounter an isolated rain shower here. The one ahead was just a mile deep. Five hours earlier, when we were driving north, we went through rain at almost the same place. In another mile, the road was dry.