Mission Gorge in the 1920s.

One of the biggest hassles we had was trying to keep some of these idiots from building a dam in Mission Gorge . . . A lot of land would have been flooded . . . Santee, Lakeside, and about a third of El Cajon Valley would have been a shallow lake.
–Fred A. Heilbron, San Diego city councilman

When San Diego seem intent on Damming Mission Gorge.