The catastrophic earthquake in Haiti and this week’s torrential downpours in the Los Angeles area are reminders that we live in areas highly susceptible to powerful forces of nature.
In the space of four years between 1857 and 1861, the Los Angeles region experienced an earthquake of unparalleled magnitude (no stronger quake has hit the area since) as well as a period of rainfall that, in severity, has also not been repeated.
Concerning earthquakes, we have been talking for years about the inevitability of the “Big One,” the major earthquake due to strike the Los Angeles region someday. The last major temblor, over 150 years ago, was the Tejon earthquake of January 1857 that has been estimated to be about 7.9 on the modern Richter scale, the same magnitude as that of the 1906 San Francisco quake.
Because the region was so sparsely populated, with about 4,000 people in the city of Los Angeles and fewer than 10,000 in the county, the Los Angeles Star newspaper reported in its January 17, 1857, edition that “on the whole, no damage of any consequence, has been sustained by our citizens, although elsewhere considerable property has been destroyed, and we regret to say, severe personal injuries inflicted, and one life even sacrificed by the awful visitation.” As for damages in Los Angeles, a school house and several homes received cracks.
The worst impact was felt in the “Grapevine,” the mountainous region north of Los Angeles. At the Reed Ranch near today’s Gorman, several people sought to flee a house and all made it to safety “except a woman, who was killed by the falling of the house.” There was also significant structural damage at the relatively new Army outpost of Fort Tejon. This is why the quake was named “Tejon” even though its activity was really to the northeast, along the San Andreas Fault (from where a future “Big One” is expected to come).
Meanwhile, “on a ranch belonging to Mr. Temple, on the San Gabriel River, the earth for a considerable distance was rent asunder, leaving a ditch some three feet wide. The disruption was traced for miles along the river, which was turned out of its bed for many rods in length.” This description referred to the Rancho La Merced, co-owned by F. P. F. Temple and Juan Matías Sanchez. The San Gabriel River at that time was actually today’s Rio Hondo, the current river not “created” until severe flooding in 1867-68 led to its new course.

Excerpt from the Los Angeles Star newspaper, January 17, 1857. From the Homestead Museum Collection.
Speaking of flooding, in the winter of 1861-62, rain fell almost continuously, often in downpours, between Christmas Eve and the end of January. While there weren’t advanced weather stations to measure precipitation levels, estimates range from thirty to fifty inches in that four- to five-week period.
Again, the damage was extraordinary and references made in the press and in autobiographies tell of the destruction wrought upon houses, as well as the washing away of crops and cattle. Large portions of the town of San Bernardino and the new German-American settlement of Anaheim were destroyed.
The Temple family at La Merced was again affected, as reported in the Star on January, 25 1862: “MERCED RANCHO, the residence of F. P. F. Temple, Esq., was flooded. The family effected their escape from the house on a raft. No injury sustained by house or property.”

Excerpt from the Los Angeles Star newspaper, January 26, 1862. From the Homestead Museum Collection.
Indeed, the area around the Temple ranch was later declared a 100-year flood plain by the U. S. Army Corps of Engineers, and the Whittier Narrows Dam was built just to the south of where the family’s adobe house once stood. Given these circumstances, it is incredible that the dwelling, built in 1851, survived for nearly sixty years. It appears that a fire, of all things, led to the building’s demise before 1910.
Widespread catastrophic flooding has since been prevented by our intricate flood control system, but we anxiously await the next “Big One” that will strike someday.










