When Lake Isabella was under construction no one knew it was directly on top of a fault line. If and when the "Big One" comes the Lake will put the city of Bakersfield some 40 miles away under many feet of water. Driving up the canyon today I understood the physics of the potential disaster. The suddenly freed waters picking up speed as it is forced into the narrow canyon. Lake Isabella is very low right now. So does that make it 13 feet over the city rather than 18 feet? On the other side of the dam...a trailer park (of course).