El Molino Viejo, Historic gristmill in San Marino, United States
The brick and adobe structure features five-foot-thick lower walls constructed with volcanic tuff and upper sections made of sun-dried adobe slabs covered in seashell mortar.
Built in 1816 by Father José María de Zalvidea from Mission San Gabriel Arcángel, El Molino Viejo stands as Southern California's first water-powered gristmill for grain processing.
The Old Mill Foundation maintains the site as a museum and art gallery, hosting rotating exhibitions of plein air art in partnership with the California Art Club.
Located at 1120 Old Mill Road in San Marino, the facility offers on-site parking and remains accessible for visitors interested in early Californian industrial architecture.
The mill utilized a horizontal direct impulse water wheel system connected to grinding stones on the second floor, powered by water from Los Robles and Kewen Canyons.
Location: San Marino
Architects: José María de Zalvidea
Website: http://old-mill.org
GPS coordinates: 34.11900,-118.12800
Latest update: September 23, 2025 14:24
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