For centuries, the famed redwood tree El Palo Alto has towered over the birth and growth of its namesake city, a witness to prosperity.

But something’s wrong: its official history.

New research by Palo Alto resident Jeff Watt, an electrical engineer with a dogged devotion to facts, is separating truth from fiction.

His findings — based on old newspaper clippings, photos, translated diaries and ephemera stored in the deep recesses of libraries — detail the tree’s long-mysterious past, contradicting the 100-year-old plaque that sits at its trunk, as well as many other historical accounts.

“Theres a lot of incorrect information,” said Watt, who hopes his insights and well-organized evidence will help the tree earn State Historical Landmark status. A previous effort in 1969 was rejected due to lack of evidence.

“What happens,” he said, “is that people describe something thats not really quite right, and then it just gets repeated over and over again. Eventually, it becomes accepted as fact. But it’s not.”

He wondered: Is El Palo Alto, located near the intersection of Palo Alto Avenue and Alma Street near El Camino Real, really the same towering tree seen by Californias earliest explorers?

Did Spanish explorer Gaspar de Portolá and his expedition camp under its boughs?

Did it once have a twin?

Yes. No. Yes. But it split much earlier than we thought.

Even the trees age is in dispute.

In this day and age of easy internet research, Jeffs work is a testament to old school, rigorous research methods, said Christine Hult-Lewis, curator of pictorial collections at UC Berkeleys Bancroft Library. This involves going back to the original primary sources, questioning earlier assumptions, and asking as many questions as possible.

According to Steve Staiger of the Palo Alto Historical Association, Jeff has investigated the tree with a thoroughness that would impress the most serious historian.

Watt has no training in historical research. With a Ph.D. in electrical engineering from Stanford, he designs computer chips for the global semiconductor company Altera.

“Im very much data-driven and evidence-based and detail-oriented,” he said. “I dont necessarily trust what other people say.”

His curiosity in local history was first piqued by an odd zoning rule, discovered while rebuilding his home near Palo Alto’s Esther Clark Park, a hidden gem of a neighborhood tucked between winding hills. Most lots have 30- to 40-foot setbacks; his was 60 feet.

Using Palo Alto’s vast historical archives, he found that his enormous setback was created during the communitys 1959 annexation by the growing city. But it was never updated.

Next, he probed the peculiarity of a nearby street. In Palo Alto, the road is spelled “Manuela.” But in Los Altos Hills, it gains an extra L: “Manuella.” He learned that the entire route — named after a daughter of early settler Juana Briones — was initially misspelled with the extra consonant. The city of Palo Alto later fixed it; Los Altos Hills, inexplicably, did not.

He wondered about El Palo Alto, the enduring emblem of his town and alma mater. In the trees youth, surrounded by grasslands, it served as the primary sentinel and gateway to the region. Directly translated, Palo Alto means tall stick in Spanish, but early Spanish explorers likely used the phrase to describe the tall tree.

The Stanford familys ranch was named Palo Alto Stock Farm in honor of the tree. The new town of University Park soon adopted the trees name. Stanford Universitys mascot costumed, dancing and sometimes inebriated is a human-size replica.

No one knows how a coastal mountain species got its start in the valleys dense clay soil, on the banks of San Francisquito Creek.

As years went by, it endured wind, parasites, droughts, floods, homeless encampments and the thick smoke of passing trains. Southern Pacific Railroad and Stanford University constructed a concrete wall to protect the tree from erosion. When its top died, it was cut, so El Palo Alto is shorter than it used to be.

By the mid-1920s, its days seemed numbered. It couldnt drink; its roots were dry due to the valleys proliferation of wells. And it couldnt breathe, its foliage covered by ashen gray particulates.

But interventions such as capped wells, cleaner trains and irrigation have helped save the life of the venerable tree.

Now it looks unremarkable, just one of many redwoods, oaks and other trees clustered along the Menlo Park border.

California’s oldest living landmark, it is portrayed — sideways, like a tiny hairbrush — in a 1776 map by priest Father Pedro Font, diarist of expedition leader Juan Bautista de Anza.

Field notes describe the expeditions arrival at the arroyo of San Francisco, on whose bank is the very tall redwood. … We arrived at its trunk and saw that it was not a single tree but two trees very close together.

Based on Fonts description, Watt is convinced that Anza saw our modern-day El Palo Alto.

The trees official plaque gets a few things wrong. The 1769 expedition led by Spanish explorer Gaspar de Portolá likely camped not under the tree but someplace closer to today’s Stanford West apartments and on the Menlo Park side of the creek. While 18th-century measurements weren’t exact, the notes say that Portolá’s creekside campsite was “a quarter of a league” — about two-thirds of a mile, based on Watt’s calculations — from the tree.

Spanish missionary Padre Francisco Palóu didnt erect a cross at the tree to mark the site of a proposed mission, later built at Santa Clara. Based on Fonts notes, the cross stood upstream. And Palóus plan for a mission shifted to San Francisco, not Santa Clara, according to later documents.

Different historic panels arent entirely true, either. The photo caption near the tree says that one trunk was swept away by a flood in the 1880s. A plaque in downtown Palo Alto, across from City Hall, says the same thing.

When was it suddenly alone?

Watt concluded, based on a photograph by famed photographer Carleton Watkins, that it was still a twin around 1874. But by 1877, a newspaper article about the Stanford farm shows just a lonely speck on the horizon. It was a single tree, said Watt.

How old is it? That remains murky. The most commonly cited age is 1,067 years, based on an 1880s-era dendrology ring count of its felled twin. In 1948, a federal study reported it was only 600 years old. In 1963, UC Berkeley estimated it was between 300 to 500 years old.

The tree still has many seasons left to grow, ecosystems to support and future stories to tell.

Watts new effort is to secure state recognition, which will add further protection. Because the tree is now proven to be linked with events that had a profound influence on Californias history, it meets the criteria, he said. Hed also like to see those plaques fixed.

​Jeff Watt’s research, said councilmember Pat Burt, a former three-term mayor with a longstanding interest in city history, will be valuable to establishing the appropriate and important historic recognition of the El Palo Alto tree and nearby related sites.