Construction began in 2011. A zoned earth and rock fill dam that is 220 feet high.

Two ancient landslides were discovered during excavation in 2012, but was not found in pre-construction geotechnical investigations.  An additional 3.5 million cu yds of excavation was required to remove the landslide materials.

Workers (bottom right) place explosives deep into the ground to… Photo-4514415.60874 – SFGate.