Rancho San Luis Gonzaga

Rancho San Luis Gonzaga was a 48,821-acre (197.57 km2) Mexican land grant in the Diablo Range, in present-day Santa Clara County and Merced County, California given in 1843 by Governor Manuel Micheltorena to Juan Carlos Pacheco and José Maria Mejía.

The eleven square league grant was made to Juan Carlos Pacheco and José Maria Mejía in 1843.

With the cession of California to the United States following the Mexican–American War, the 1848 Treaty of Guadalupe Hidalgo provided that the land grants would be honored.

[9] Paula Fatjó, a great granddaughter of Ysidora and Mariano Malarin, inherited 16,000 acres (64.7 km2) of the ranch land in 1948, and used it to raise horses and cattle.

The majority of her property was condemned by the state of California in 1962 to create the San Luis Reservoir, and the original 1846 ranch house, which she had restored, was destroyed in an attempt to move it away from the area flooded by the new lake.