Rancho El Rincon The one square league Rancho El Rincón was granted to Juan Bandini by Governor Alvarado in 1839. Juan Bandini sold the rancho to
Bernardo Yorba. Bernardo Yorba was the grantee of Rancho Cañón de Santa Ana and
Rancho La Sierra. 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 El Rincon was filed with the
Public Land Commission in 1853, and the grant was
patented to Bernardo Yorba in 1879.
Rincon and Prado A village called Rincón developed near the river crossing on the Santa Ana River, near the upper mouth of the canyon cut by the river between the
Chino Hills and the mountains to the south. It had a post office from December 12, 1870, to August 24, 1874, and from November 19, 1887, to April 11, 1907. At the request of the
Santa Fe Railway, which already had stops in several towns also named Rincón, the name of the town and post office was changed to Prado ("meadow") in 1907. This new post office operated until May 31, 1935, when it was consolidated with Corona. Following the destruction of much of the town and local farms in the Flood of 1938, the village of Prado was removed during the building of
Prado Dam in 1941. ==Historic sites of the Rancho==