South Colton
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Tahualtapa (Mt. Slover)
Cement Plant Rd. at S. Rancho Ave., Colton
Today, a gigantic stack of containers—parked there by BNSF Railway—rises high upon land that was once a mountain, and was mined out of existence for the cement used to build the roads and highways of the I.E. It serves as a new landmark to the legacy of logistics and its effects on health and the environment.
Colton’s location at the crossing of two transcontinental railroads made it a 19th-century hub for distribution of citrus and cement. Known by the Cahuilla as Tahualtapa, the sacred “Hill of the Ravens” once towered over the city of Colton. After a century of mining, the mountain gradually disappeared, ground down and transformed into freeways, highways, and viaducts. The dust also dispersed— into the lungs and homes of the Mexican American workforce living nearby in segregated but thriving South Colton. Many residents felt thankful for the jobs supplied by the railroads and cement plant, despite the low pay and dangerous conditions. Others sought to protect themselves through often-fraught unionization efforts. The destruction of the natural landscape and way of life has cemented Colton’s future, laying the ground (literally) for more than a billion square feet of distribution warehouses and tens of thousands of trucks and trains that serve them daily.
From the Archives
by A People’s History of the I.E.
Click on the images below to uncover the story.
“Tahualtapa is Hill of the Ravens in the Cahuilla creation story…going back 10,000 years.”
—Henry Vasquez
Settlers and the extractive industries they built displaced Native people, destroyed their sacred mountain, and denied their long standing presence in Colton. They killed the native flora and fauna, including the grizzly bears which once lived on the mountain, and mined the mountain for its limestone and marble.
In 1917, as the U.S. entered World War I, a 30-foot American flag was raised on Mt. Slover, becoming one of only three places where the flag was permitted to be flown at night. Planting the flag was a patriotic gesture but also a colonial one, visually claiming the space as America’s and denying Indigenous claims to the land.
“Unfurling of Colton’s Liberty Flag is a Wondrous Spectacle,” San Bernardino Daily Sun, 1917
As early as the 1850s marble and limestone were quarried from Mt. Slover. Mining operations grew when the California Portland Cement Company became the first such plant west of the Mississippi in 1891.
The mountain provided raw materials that literally built the region, its concrete the face of the mission revival architectural style that dominated Southern California and the base of the streets and highways throughout the region.
Mt. Slover’s mining operation continued until 2009, supplying materials for the post WWII construction boom.
1890s postcard showing the “New” Cement plant in Colton, private collection
CalPort Cement, like Colton’s other industries, relied on the city’s robust railway infrastructure. The Santa Fe and Southern Pacific Railroads intersect at the Colton Crossing. It was the distribution hub of the region, transporting cement, citrus, and other goods across the state and the nation. While the rail lines connected industries, they divided the community. The area south of the tracks became the “Mexican side of town” for decades.
“Having the tracks there and then the freeway it just solidified the division for, for a long time… It created a de facto segregation of North and South Colton. Colton Police actually enforced it. …They still would say, ‘You're on the wrong side of the tracks to get back to your side of town.’”
—Frank Acosta
Colton’s railyard c. 1940, courtesy Chuck Vasquez
“The mountain wasn’t that far away. But you could hear a siren going off. After that you could hear a blast. Visually you could see from a distance this puff go up in the air. And then you could hear, seconds later depending on how far you were away, a kaboom. And that would float all over Colton. Just very fine dust.”
—Oscar Colunga
To mine Mt. Slover, CalPort Cement used heavy machinery and explosives. In 1928, the earth shook so strongly that Colton residents thought there was an earthquake. It was a routine explosion that displaced 750,000 tons of rocks.
Colton residents were all affected by the mining operation. The fine particulate matter and other air pollution from local industry, agriculture, and smog are likely the cause of some of the community’s chronic health problems like those of Oscar’s mother, Victoria.
“My mother had asthma and at times it was real, real bad. And it was constant, which was also crippling in a way. I think a lot of that cement dust was not good for the residents around there.”
Dust plume at California Portland Cement, courtesy of Special Collections & University Archives, UC Riverside
During the first 14 years of production, the CalPort Cement Co. faced lawsuits by surrounding landowners due to the impacts of dust on crops and people. The “explosion of dynamite interferes with the peaceful enjoyment of the land,” complained one neighbor. As a settlement, CalPort Cement bought them out, purchasing 120 acres of orange groves. The company also installed new “dust retainers” that still did not solve the dust problem.
The plant continued to operate the groves for decades, not necessarily for profit but to maintain a romantic view that heavy industry could coexist with an edenic landscape. The cover image advertising the National Orange Show juxtaposes Mt. Slover’s industry and puff of cement dust with the orderly lines of orange trees. Regional boosters often promoted the region’s seeming harmony between “nature” and industry.
Cover, Sun Telegram March 11, 1951, courtesy of Ben Sakaguchi
Labor conditions at CalPort Cement were often unsafe. Workers would tunnel into the mountain to transport carts full of limestone and other valuable minerals. Workers experienced poor ventilation, dust inhalation, and in the most catastrophic of incidents, cave-ins.
“He was a miner in the deep part of the cement plant. They didn’t have the aluminum hats at that point in time. They were working down there and they heard this rumble, and they knew — they knew. And he started running to get away from this avalanche, and a rock hit him and knocked him out. All of a sudden he felt something hitting his face and he put his hand to his face and it was blood. He looked over there and there was his friend, a rock had decapitated him and his heart was still beating, and it was through the blood in his face, and that’s what woke him up.”
—Adam Ornelas, sharing a story told to him by a CalPort laborer.
CalPort miner emerging from the tunnels, courtesy of Special Collections & University Archives, UC Riverside
Plant workers fought for better working conditions and higher pay at the cement plant, as they did in railroads and other industries in the region. In 1917, Mexican workers with Trabajados Unidos went on strike. Tom Rivera explained,
“They formed a strike against the cement plant because they were not getting as much salary paid as the white persons were. So they went on strike for a couple of months, and they won that strike.”
Not all strikes were won, and being a part of the union could put one’s livelihood in danger.
“At that time, my Father was beginning to get involved in unionizing, and of course, the cement plant didn’t appreciate that…there was such fear in the life of those men working there. It was their livelihood and they didn’t want to lose it, so they didn’t back him up.”
—Teresa Elena Constant
Asociación de Trabajadores Unidos, Colton, 1917, courtesy of Mark Ocegueda
In the post-war era there were mounting concerns over health and safety at the plant, as well as pressure by the EPA to control emissions. These concerns persisted until the plant’s closure in 2009.
“I think [my father] worked in the area where they did all the blasting because that’s how he had his accident. And he suffered from that for the rest of his life. It never healed.”
—Henry Vasquez
Miner standing in a Cal Port blast zone, courtesy of Special Collections & University Archives, UC Riverside
Despite patterns of segregation and labor exploitation South Colton was a thriving neighborhood with over a dozen local markets, active civic organizations, and cultural celebrations. The landscape of cement was the playground for family picnics and sporting events. Concrete pipes were even painted different colors and installed at local parks.
Family members pose for a snapshot in one of the concrete pipes by Hydro Conduit, courtesy of the extended Colunga family.
While residents voiced concerns about health and safety, the cement plant worked to assuage public opinion through philanthropy. The company donated land for South Colton’s Veterans Park in 1939, sponsored bowling and baseball teams, and hosted parade floats.
CalPort also sponsored the Dieciséis de Septiembre (16th of September) celebrations in which South Colton residents proudly celebrated Mexican Independence Day. A fixture of the event was the election of one local girl as Queen. Veterans Park was a crucial space for community building and resilience in a segregated city.
The 1945 Dieciséis de Septiembre Queen and her court, courtesy of the extended Colunga family.
Mt. Slover is now leveled after over a century of mining operations. The plant ceased operations in 2009. BNSF Railway owns the land, which it uses as a holding area for shipping containers stacked high, as if mimicking the terraced appearance of the halfway mined mountain.
Tamara Cedré, The Leveled Top of Mt. Slover, 2024, courtesy Tamara Cedré
In 2020, BNSF proposed to build a new intermodal rail facility on the property in order to redirect more freight through the Inland Empire and free up other tracks for California’s High Speed Rail Project. The plan met with concern from residents in the historically burdened area of South Colton, and is not going forward. What happens next is not clear.
Tamara Cedré, Aerial of Colton Rail Corridors, 2024, courtesy of the artist
In Place of a Mountain | Colton
by Tamara Cedré
Howard Kelly
Colton Plant, Riverside Portland Cement Co., Mt. Slover, 1954
Reproduction, archival pigment print
Kelly-Holiday Mid-Century Aerial Collection, Los Angeles Public Library
G. Haven Bishop
Power Consumers, Portland Cement Works, Southern California Edison, 1910
Reproduction, archival pigment print
The Huntington Library, San Marino, California
G. Haven Bishop
Colton Cement Aerial, Southern California Edison, 1955
Reproduction, archival pigment print
The Huntington Library, San Marino, California
“Unfurling of Colton’s Liberty Flag is a Wondrous Spectacle,” San Bernardino Daily Sun, 1917
Reproduction on dibond
Courtesy of San Bernardino Daily Sun
Tamara Cedré
Liberty Unfurled, 2024
Archival pigment print
Courtesy of the artist
Tamara Cedré
Postcards from Colton Cement Works, 2024
Archival pigment print
Courtesy of the artist
Tamara Cedré
The Leveled Top of Mt. Slover, 2024
Archival pigment print
Courtesy of the artist
Tamara Cedré
Limestone Gravel, 2024
Archival pigment print
Courtesy of the artist
Colton Chamber of Commerce
Colton The Hub City, 1914
Reproduction on dibond
Private collection
Sunset Route to Colton Station, 1949
Gelatin silver print photograph
Private collection
Tamara Cedré
Agua Mansa Pioneer Cemetery in Industrial Corridor, 2024
Archival pigment print
Courtesy of the artist
Tamara Cedré
Colton Crossing, 2024
Archival pigment print
Courtesy of the artist
Colunga Family Snapshots from South Colton, 1945-54
Reproduction, archival pigment print
Courtesy of the Colunga extended family
Tamara Cedré
Colton Corridors, 2024
Archival pigment prints
Courtesy of the artist
Resources
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CCAEJ – Center for Community Action and Environmental Justiceis a community-based organization fighting for environmental justice and equity in Bloomington and throughout the I.E.
PC4EJ – People’s Collective for Environmental Justice fights for environmental justice and challenges the cultural and systemic roots of white supremacy.
Unite For Colton works to create positive change that respects the land and community.
We Are Colton is a collective of Colton residents working to create a healthier community.
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Climates of Inequality, “Trujillo Adobe Created and Destroyed by Logistics.”
Frontline Observer, “Community Concerned Over New Railyard Indirect Source Rule.”
PBS SoCal, “Agua Mansa: Californio Roots in the Inland Empire.”
PBS So-Cal, “High Speed Rail Project Could Further Pollute Historically Burdened Colton Community.”
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Cal State University San Bernardino’s South Colton Oral History Project documents life in the neighborhood with interviews and photographs.
Colton Area Museum reopened in March 2024, to present more inclusive exhibits. Located in a historic library at 380 N. La Cadena Drive; open to the public 10 a.m. to 2 p.m. Fridays and Saturdays. No website as of this posting.
People’s History of the I.E. Digital Archive includes materials documenting Colton.