Lake Cuyamaca, S.R. 79, Between I-8 and Julian, California (4)
Rancho Cuyamaca was a 35,501-acre (143.67 km2) Mexican land grant in present day San Diego County, California given in 1845 by Governor Pío Pico to Agustin Olvera. The grant extended south of present day Julian and encompassed Cuyamaca Rancho State Park, Lake Cuyamaca, and Cuyamaca Peak.
Olvera remained in Los Angeles and never resided on the grant. For several years, his agent Cesario Walker began lumber operations but was driven out by Indians.
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. As required by the Land Act of 1851, a claim for Rancho Cuyamaca, filed with the Public Land Commission in 1852. The grant contained no mention of size nor was there any description of boundaries. It was specified in the grant that it was to be measured and maps made. But, with the exception of a crude map of indefinite date, nothing seems to have been done until it came before the land commission.