When the Colorado flowed into that valley, it also flowed out through the Hardy River, with the exit near Nuevo Leon. The metastable state that existed then inu

When the Colorado flowed into that valley, it also flowed out through the Hardy River, with the exit near Nuevo Leon. The metastable state that existed then inundated most of what is now the Imperial Valley; the city of Mexicali (pop ~1M) would be underwater.