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El Palo Alto is 110 feet (33.5 meters) in height (compared to 134.6 feet or 41 meters in 1951), 90 inches (2.3 meters) in diameter, and has a crown spread of 40 feet (12 meters).
The tree is California Historical Landmark No. 2 (number 1 is the custom house in Monterey), is recognized by the National Arborist Association and International Society of Arboriculture for its historical significance as "a campsite for the Portola Expedition Party of 1769"; being frequented by the Coastanoan/ Ohlone Indians; and for its use as a sighting tree by surveyors plotting out El Camino Real. The tree is depicted on the city of Palo Alto's official seal and on the seal of Stanford University.
The tree is 1063 years old and is reportedly healthier today than 100 years ago. El Palo Alto originally had twin trunks, but a 1887 flood in the San Francisquito arroyo tore off one of the two.
A plaque at the base of the tree bears the following inscription: