{"nrhp_refnum":"71000154","name":"El Molino Viejo","other_names":["Old Mill"],"category":"building","location":{"address":"1120 Old Mill Rd.","address_restricted":false,"city":"Pasadena","county":"Los Angeles County","state":"CA","lat":34.125599640000075,"lon":-118.12782298399998,"geom_source":"nps_gis"},"listed_date":"1971-05-06","is_nhl":false,"nhl_designated_date":null,"areas_of_significance":["Industry","Commerce","Architecture"],"significance_levels":["state"],"summary":{"what_it_is":"El Molino Viejo (the Old Mill) is a two-story heavy masonry grist mill at 1120 Old Mill Road in San Marino (Pasadena area), Los Angeles County, California, built for Mission San Gabriel and finished about 1816.","why_significant":"The mill was designed by Father Zalvidea, who pioneered a horizontal, direct impulse waterwheel, and was built by Mission Indians in the Spanish tradition. It is recognized for its architecture, industry and commerce, and is tied to Mission San Gabriel and later owners such as Henry E. Huntington. The nomination rates its significance at the local level.","narrative":"El Molino Viejo, also called the Old Mill, is a two-story grist mill about two miles north of Mission San Gabriel, at 1120 Old Mill Road in San Marino. Mission Indians built it under the supervision of the Majordomo, finishing it about 1816 in the Spanish tradition. The lower walls, five feet thick, are quarried volcanic stone with corner buttresses, while the upper walls are handmade adobe brick under a clay tile roof. Father Zalvidea designed it and pioneered a horizontal, direct impulse waterwheel, fed by a cement-lined ditch from Kewan and Los Robles Canyons and a cistern along the west wall. Once another mill was built nearer the mission, this one was gradually abandoned and passed from mission control. Later owners, including Henry E. Huntington, restored and converted it into a residence without structural changes to the original walls. It is now owned by the City of San Marino and is recognized for its architecture, industry and commerce.","period_of_significance":"1816 (19th Century)","architect_builder":"Designed by Father Zalvidea; built by Mission Indians under the supervision of the Majordomo","architectural_style":"Spanish tradition","criteria":[],"status_note":"Condition listed as good and altered; converted by later owners into a residence without structural changes to the original walls, and now owned by the City of San Marino.","vacant_flag":null,"machine_generated":true,"model":"claude-sonnet-5-5","prompt_version":"v1.0-2026-10-29","generated_at":"2026-10-29 02:55:31.626697-05","source_pdf":"https://s3.amazonaws.com/NARAprodstorage/lz/electronic-records/rg-079/NPS_CA/71000154.pdf"},"photo":{"url_800":"https://nationalhistoricalregister.com/media/71000154/655f1c9963-800.webp","url_1600":"https://nationalhistoricalregister.com/media/71000154/655f1c9963-1600.webp","licence":"Public domain","author":"The original uploader was Tillman at English Wikipedia.","credit_html":"<a href=\"https://commons.wikimedia.org/wiki/File:MolinoViejo.jpg\" rel=\"noopener\">The original uploader was Tillman at English Wikipedia.</a>, Public domain, via Wikimedia Commons","source_page":"https://commons.wikimedia.org/wiki/File:MolinoViejo.jpg"},"district":null,"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":"https://catalog.archives.gov/id/123859080","wikipedia":"https://en.wikipedia.org/wiki/El_Molino_Viejo","wikidata":"https://www.wikidata.org/wiki/Q5351617"},"indexable":true,"url":"https://nationalhistoricalregister.com/california/los-angeles-county/el-molino-viejo-71000154/"}