Lake Berryessa is the largest lake in Napa County, California. This reservoir in the Vaca Mountains was formed following the construction of the Monticello Dam on Putah Creek in the 1950's. Since the early 1960's, this reservoir has provided water and hydroelectricity to the North Bay region of the San Francisco Bay Area.
The reservoir was named for the first European settlers in the Berryessa Valley, José Jesús and Sexto "Sisto" Berrelleza, who were granted Rancho Las Putas in 1843.
Coordinates 38°35'19.384" N -122°13'45.987" E