by Bruce Wells | Apr 10, 2025 | Petroleum Pioneers
Natural oil seeps, giant oilfields, and the beginning of the California petroleum industry.
“Everyone thinks of Los Angeles as the ultimate car city, but the city’s relationship with petroleum products is far more significant than just consumption.” — Center for Land Use Interpretation
When struggling prospector Edward L. Doheny and his mining partner Charles Canfield decided to dig a well in 1892, they chose a site already known for its “tar” pools that bubbled to the surface. (more…)
by Bruce Wells | Feb 21, 2025 | Petroleum Technology
Wells on manmade islands save “America’s Sinking City.”
Reversing an earlier ban, voters in Long Beach, California, in 1962 approved petroleum exploration in their harbor. Five major oil companies formed a company called THUMS and built four artificial islands to produce the oil.
California’s headline-making 1921 oil discovery at Signal Hill launched a drilling boom that transformed the quiet residential area. So many derricks sprouted it became known as “Porcupine Hill.”
Island Grissom, one of the four THUMS islands at Long Beach, California, was named after NASA astronaut Col. Virgil “Gus” Grissom, who died in 1967 in the Apollo spacecraft fire. Photo courtesy U.S. Department of Energy.
With many homeowners aspiring to become drillers and oilfield speculators, much of Signal Hill’s land was sold and subdivided in real estate lots of a size described as “big enough to raise chickens.”
Derricks were so close to one cemetery that graves “generated royalty checks to next-of-kin when oil was drawn from beneath family plots,” noted one historian. Neighboring Long Beach joined the drilling boom.
By 1923, oil production reached more than one-quarter million barrels of oil per day. When Long Beach instituted a per-barrel oil tax, Signal Hill residents voted to incorporate in 1924.
At the time, “the law of capture” for petroleum production ensured the formerly scenic landscape would be transformed. Competing exploration and production companies crowded around newly completed wells and chased any signs of oil to the Pacific Ocean.
The islands are among the most innovative oilfield designs in the world. Circa 1965 illustration courtesy Oxy Petroleum.
By the early 1930s, the massive Wilmington oilfield extended through Long Beach as reservoir management concerns remained in the future. Naturally produced California oil seeps had led to many discoveries south of the 1892 Los Angeles City field.
Onshore and offshore tax revenues generated by production of more than one billion barrels of oil and one trillion cubic feet of natural gas helped underwrite much of the Los Angeles area’s economic growth. But not without consequences.
Long Beach: A Sinking City
The U.S. Army Corps of Engineers reported, “Subsidence, the sinking of the ground surface, is typically caused by extracting fluids from the subsurface.”
Petroleum reserves brought drilling booms to southern California. By 1923, oil production reached more than one-quarter million barrels of oil per day from Signal Hill, seen in the distance in this detail from a panorama from the Library of Congress.
Californians had a lot of experience dealing with groundwater induced subsidence and the building damage it caused, but by 1951, Long Beach was sinking at the alarming rate of about two feet each year.
Earth scientists noted that between 1928 and 1965, the community sank almost 30 feet. TIME magazine call the bustling port “America’s Sinking City.”
After decades of prospering from petroleum production, the city prohibited “offshore area” drilling to slow the subsidence as the community looked for a solution.
On February 27, 1962, Long Beach voters approved “controlled exploration and exploitation of the oil and gas reserves” underlying their harbor. The city’s charter had prohibited such drilling since a 1956 referendum. Advancements in oilfield technologies enabled Long Beach to stay afloat.
Directional drilling and water injection opened another 6,500 acres of the Wilmington field — and saved the sinking city.
THUMS: Texaco, Humble, Union, Mobil and Shell
Five oil companies formed a Long Beach company called THUMS: Texaco (now Chevron), Humble (now ExxonMobil), Union Oil (now Chevron), Mobil (now ExxonMobil) and Shell Oil Company. They built four artificial islands at a cost of $22 million in 1965 (more than $200 in 2024 dollars).
The islands — named in 1967 Grissom, White, Chaffee, and Freemen in honor of lost NASA astronauts would include 42 acres for about 1,000 active wells producing 46,000 barrels of oil and 9 million cubic feet of natural gas a day.
The prospering but “sinking city” of Long Beach would solve its subsidence problem with four islands and advanced drilling and production technologies. Photo by Roger Coar, 1959, courtesy Long Beach Historical Society.
To counter subsidence, five 1,750-horsepower motors on White Island drive water injection pumps to offset extracted petroleum, sustain reservoir pressures, and extend oil recovery. The challenge was once described as “a massive Rubik’s Cube of oil pockets, fault blocks, fluid pressures and piping systems.”
Meanwhile, all of this happens amidst the scenic boating and tourist waters in Long Beach Harbor.
The California Resources Corporation operates the offshore part on the islands of the Wilmington field, the fourth-largest U.S. oilfield, according to the Los Angeles Association of Professional Landmen, whose members toured the facilities in November 2017.
Producing in Plain Sight
“Most interestingly, the islands were designed to blend in with the surrounding coastal environment,” explained LAAPL Education Chair Blake W.E. Barton of Signal Hill Petroleum. “The drilling rigs and other above-ground equipment are camouflaged and sound-proofed with faux skyscraper skins and waterfalls.”
Most people simply do not realize the islands are petroleum production facilities. From the shore, the man-made islands appear occupied by upscale condos and lush vegetation. Many of the creative disguises came courtesy of Joseph Linesch, a pioneering designer who helped landscape Disneyland.
The THUMs islands required exceptional designs, and “the people who were involved at the time were very creative visionaries,” said Frank Komin, executive vice president for southern operations of the California Resources Corporation (CRC), owner of the islands.
About 80 percent of the company’s properties would overlie the Wilmington oilfield, according to CRC, noting that from 2003 to 2018, CRC operations generated over $5.2 billion in revenues, taxes and fees for the City of Long Beach and the state.
THUMS Island White, named for Col. Edward White II, the first American to walk in space, who died in 1967 along with NASA astronauts “Gus” Grissom and Roger B. Chaffee. A fourth island was named for NASA test pilot Ted Freeman, who in 1963 was the first fatality among the astronauts. Photo courtesy UCLA Library.
“Even today, those islands are viewed as one of the most innovative oil field designs in the world,” CRC executive Komin declared in a 2015 Long Beach Business Journal article. “The islands have grown to become icons in which the City of Long Beach takes a great deal of pride.”
The Journal explained that 640,000 tons of boulders, some as large as five tons, were mined and placed to build up the perimeters of the islands. “Concrete facades constructed for aesthetic purposes also divert industrial noise away from nearby residents,” the article added. For more noise abatement, electricity has provided nearly all the power for the islands.
The THUMS aesthetic integration of 175-foot derricks and production structures has been described by the Los Angeles Times as, “part Disney, part Jetsons, part Swiss Family Robinson.”
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Recommended Reading: An Ocean of Oil: A Century of Political Struggle over Petroleum Off the California Coast (1998); Black Gold in California: The Story of California Petroleum Industry 
(2016); Early California Oil: A Photographic History, 1865-1940
(1985). Your Amazon purchases benefit the American Oil & Gas Historical Society. As an Amazon Associate, AOGHS earns a commission from qualifying purchases.
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The American Oil & Gas Historical Society (AOGHS) preserves U.S. petroleum history. Please become an AOGHS annual supporter and help maintain this energy education website and expand historical research. For more information, contact bawells@aoghs.org. Copyright © 2025 Bruce A. Wells. All rights reserved.
Citation Information – Article Title: “THUMS – California’s Hidden Oil Islands.” Authors: B.A. Wells and K.L. Wells. Website Name: American Oil & Gas Historical Society. URL: https://aoghs.org/technology/thums-california-hidden-oil-islands. Last Updated: February 25, 2025. Original Published Date: March 8, 2018.
by Bruce Wells | Jan 22, 2025 | Petroleum Companies
Rise and fall of a California oil exploration company.
A new “black gold” rush in California took off in 1886 after William Rowland and partner William Lacy completed several producing oil wells at Rancho La Puente. Their company, Rowland & Lacy (later called the Puente Crude Oil Company), helped reveal the Puente oilfield.
The exploration venture — and a more successful one with a similar name, the Puente Oil Company — were among those seeking oil in southern California at the turn of the century. By 1912, many inexperienced companies had drilled more than 100 wells in the Fullerton area southeast of the Los Angeles field. Two expensive “dry holes” were completed by the Puente Crude Oil Company.
Puente Crude Oil Company was one of many small early 20th-century ventures hoping to find oil in southern California’s prolific oilfields at Brea Canyon and Fullerton.
Initially capitalized with $500,000, Puente Crude Oil offered stock to the public at 10 cents a share in 1900, but its two unsuccessful wells in the Puente field’s eastern extension brought the company to a quick financial crisis.
One well was lost to a “crooked hole” and the other found only traces of oil and natural gas as enthusiastic advertisements continued to solicit investment. Some ads referred to the widely known Sunset oilfield, discovered in 1892 in Kern County to the north.
By May 1901 company stock was offered at two cents per share to relieve indebtedness and enable further drilling on the company’s 870 acres in Rodeo Canyon. One year later, San Bernardino newspapers reported the company in trouble.
“This history of misadventure has not been pleasing to the stockholders of the Puente Crude Oil Company,” noted one article. “An auditing committee was appointed for the purpose of examining the books and accounts of the company,” it added.
Further reports in 1902 noted the company had issued no statements, “financial or otherwise,” for a year. Puente Crude Oil Company is absent from records thereafter.
South of Los Angeles, in Orange County, the Brea Museum and Heritage Center tells the story of the Olinda Oil Well No. 1 well of 1898 – one of many important California petroleum discoveries. Visit the Olinda Oil Museum and Trail at 4025 Santa Fe Road in Brea.
Much of Puente Oil’s former oil-producing land would later be managed by the Puente Hills Landfill Native Habitat Preservation Authority. In 2022, the Port of Los Angeles handled more than 220 million metric tons — 20 percent of all incoming cargo for the United States.
The stories of exploration and production (E&P) companies joining U.S. petroleum booms (and avoiding busts) can be found updated in Is my Old Oil Stock worth Anything?
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Recommended Reading: Los Angeles, California, Images of America
(2001). Your Amazon purchase benefits the American Oil & Gas Historical Society. As an Amazon Associate, AOGHS earns a commission from qualifying purchases.
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The American Oil & Gas Historical Society (AOGHS) preserves U.S. petroleum history. Please become an AOGHS annual supporter and help maintain this energy education website and expand historical research. For more information, contact bawells@aoghs.org. Copyright © 2025 Bruce A. Wells. All rights reserved.
Citation Information – Article Title: “Puente Crude Oil Company.” Authors: B.A. Wells and K.L. Wells. Website Name: American Oil & Gas Historical Society. URL: https://aoghs.org/old-oil-stocks/puente-crude-oil-company. Last Updated: January 30, 2025. Original Published Date: July 2, 2013.
by Bruce Wells | Jan 22, 2025 | Offshore History
Exploring the 1969 offshore disaster and the geology of ancient natural petroleum seeps.
A 1969 oil spill from a California offshore platform transformed the public’s view of the U.S. petroleum industry and helped launch the modern environmental movement — and the Environmental Protection Agency. Ancient natural seeps continue to produce thousands of tons of oil every day.
On January 28, 1969, after drilling 3,500 feet below the ocean floor, a Union Oil Company drilling platform six miles off Santa Barbara, suffered a blowout. Between 80,000 and 100,000 barrels of oil flowed into the Pacific Ocean and onto beaches, including at Summerland, where the U.S. offshore industry began in 1896 with drilling on oil well piers. (more…)
by Bruce Wells | Sep 19, 2024 | Petroleum Pioneers
Pico Canyon oilfield brought pipelines, refineries and Chevron.
Following the 1859 first commercial U.S. oil discovery in Pennsylvania, the earliest petroleum exploration companies were attracted to California’s natural oil seeps. Small but promising discoveries after the Civil War led to the state’s first gusher in 1876 — and the launching of a new California industry.
Pico Canyon, less than 35 miles north of Los Angeles, produced limited amounts of oil as early as 1855, but there was no market for the petroleum found near natural oil seeps. The first California drilling boom arrived a decade later in the northern part of the state with an oilfield also found near seeps.
Humboldt County Oil
Completed in 1865 by the Old Union Matolle Oil Company, the Humboldt County well produced oil near the aptly named Petrolia. The oilfield discovery quickly attracted some of America’s earliest exploration companies.
Detail of a 1908 “Map of Humboldt County Oil Lands” includes post-Civil War commercial oil wells that attracted more drilling to northern California. Map courtesy Humboldt County Map Collection, Cal Poly Humboldt Library Special Collection.
A California historical marker (no. 543) dedicated on November 10, 1955 declared:
California’s First Drilled Oil Wells — California’s first drilled oil wells producing crude to be refined and sold commercially were located on the north fork of the River approximately three miles east of here. The Old Union Mattole Oil Company made its first shipment of oil from here in June 1865 to a San Francisco refinery. Many old wellheads remain today.
Although the “Old Union well” initially yielded about 30 barrels of high-quality oil, production declined to one barrel of oil per day and the prospect was abandoned, according to K.R. Aalto, a geologist at Humboldt State University.
The Humboldt County well in what became the oilfield, “attracted interest and investment among oilmen because of the abundance of oil and gas seeps throughout that region,” Aalto noted in his 2011 article in Oil-Industry History. But the California petroleum industry truly began to the south, at Pico Canyon Oilfield, a few miles west of Newhall.
Pico Canyon Well No. 4
In Pico Canyon of the Santa Susana Mountains, Charles A. Mentry (1847-1900), who had formed a partnership establishing the California Star Oil Works Company, drilled three exploratory wells between 1875 and 1876. All showed promise and the first West Coast oil gusher arrived with his fourth well. The oilfield discovery would lead to creation of major oil company.
The steam boiler and cable tools, including the “walking beam,” of Pico Well No. 4 in 1877. Photo by Carleton Watkins courtesy Los Angeles Public Library Photo Collection.
Drilling with a steam-powered cable-tool rig in an area known for its many oil seeps, Mentry discovered the Pico Canyon oilfield north of Los Angeles. California’s first truly commercial oil well, the Pico Well No. 4 gusher of September 26, 1876, prompted more development, including pipeline construction and an oil refinery for producing kerosene.
According to an article in the Los Angeles Times, the well initially produced 25 barrels a day from 370 feet. Mentry improvised many of his cable tools, including making a drill stem out of old railroad car axles he welded together.
“The railroad had not then been completed, there was no road into the canyon, water was almost unattainable, and there were no adequate tools or machinery to be had,” noted the Times article.
Charles Mentry, already had successfully drilled 42 wells near Titusville, Pennsylvania, before exploring in the Santa Clara Valley — and launching California’s petroleum industry. Photo courtesy KHTS Radio, Santa Clara.
Mentry persevered and his success in Pico Canyon led to the founding of “Mentryville,” the onetime drilling boom town today site of Stevenson Ranch.
“Although his life was tragically cut short by illness on October 4, 1900, from typhoid fever, Mentry’s legacy as a pioneer in California’s oil industry endures,” noted KHTS Radio, Santa Clara. “His work in Pico Canyon not only made him a key figure in the region’s development but also set the stage for California’s future as an oil-rich state,” KHTS reported in 2025.
Visit the Santa Clarita Valley Historical Society website to learn more Pico Canyon petroleum exploration and production history.
First Refinery
California Star Oil Works deepened the well to 560 feet, increasing daily production by 125 barrels, and constructed its pipeline from Pico Canyon to the newly built refinery in Newhall, just south of Santa Clarita.
By 1880, California’s first commercial refinery processed oil from its first commercial oil well to make kerosene and other products. Photo courtesy the Santa Clarita Valley Historical Society.
Producing kerosene and lubricants, Newhall’s Pioneer Refinery on Pine Street would become the first successful commercial refinery in the West. Giant stills set on brick foundations included two capable of producing 150 barrels a day each. The city of Santa Clarita received California’s first successful refinery as a gift from Chevron in 1997.
The Santa Clarita refinery, today preserved as a tourist attraction, is among the oldest in the world. The major oil company can trace its beginnings to the 1876 Pico Canyon oil well, which has been designated a historic site by the California Office of Historic Preservation.
Chevron Corporation, once the Standard Oil Company of California, in 1900 acquired Pacific Coast Oil Company. Pacific Coast had become majority owner of California Star Oil Works in 1879.
Santa Clarita acquired California’s first refinery as a gift from Chevron in 1997. It is one of the oldest existing oil refinery sites in the world. Photo by Konrad Summers.
Refining Kerosene for Lamps
California’s commercial refineries were among the first in America, where the industry began with small refineries in Pittsburgh, Pennsylvania, producing kerosene for lamps. The oil came from Titusville area oilfields — and a giant 1871 field discovered at Bradford, about 70 miles to the northeast.
The Bradford oilfield, which became known as America’s “first billion-dollar oilfield,” launched many Pennsylvania refineries, including the still-operating American Refining Group. The field’s first well produced just 10 barrels a day from 1,110 feet.
By 1875. Bradford leases reached as high as $1,000 per acre. A decade later, a sudden decline in the oilfield’s production led to a technological breakthrough. Pioneers in the new science of petroleum geology suggested that water pressure on oil sands could be used to increase oil production — “waterflooding” the geologic formation.
The oldest operating U.S. oil refinery began in 1881 in Bradford, Pennsylvania.
In Neodesha, Kansas, the Norman No. 1 well of 1892 well revealed a petroleum-rich geologic region that would extend across Oklahoma, Texas and Louisiana. Standard Oil built a refinery in Neodesha in 1897 that refined 500 barrels of oil a day. Standard was the first to process oil from the giant Mid-Continent field (learn more in Kansas Well reveals Mid-Continent).
As of January 1, 2022, there were 130 operable petroleum refineries in the United States, according to the Energy Information Administration (EIA), down from 141 refineries in 2017.
Built in 1897, a Standard Oil refinery in Neodesha, Kansas, refined 500 barrels of oil per day – the first to process oil from the Mid-Continent field. From “Kansas Memory” collection of the Kansas Historical Society.
For an investigation into which California oil well was the first, see this 2011 SearchReSearch blog of Dan Russell.
Learn more California petroleum history in the Signal Hill Oil Boom.
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Recommended Reading: California State University, Dominguez Hills
(2010); Pico Canyon Chronicles: The Story of California’s Pioneer Oil Field
(1985). Your Amazon purchase benefits the American Oil & Gas Historical Society. As an Amazon Associate, AOGHS earns a commission from qualifying purchases.
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The American Oil & Gas Historical Society (AOGHS) preserves U.S. petroleum history. Please become an AOGHS annual supporter and help maintain this energy education website and expand historical research. For more information, contact bawells@aoghs.org. Copyright © 2025 Bruce A. Wells.
Citation Information: Article Title: “First California Oil Well.” Authors: B.A. Wells and K.L. Wells. Website Name: American Oil & Gas Historical Society. URL: https://aoghs.org/petroleum-pioneers/first-california-oil-well. Last Updated: April 10, 2025. Original Published Date: September 9, 2015.
