{"nrhp_refnum":"05000843","name":"Euclid Avenue","other_names":["Ca 83"],"category":"structure","location":{"address":"From 24th St. in Upland to Philadelphia St. in Ontario","address_restricted":false,"city":"Upland","county":"San Bernardino County","state":"CA","lat":34.15023317600003,"lon":-117.65141892899999,"geom_source":"nps_gis"},"listed_date":"2005-08-10","is_nhl":false,"nhl_designated_date":null,"areas_of_significance":["Community Planning and Development","Social History","Landscape Architecture"],"significance_levels":["local"],"summary":{"what_it_is":"An approximately 8.4-mile section of Euclid Avenue (State Route 83), a 200-foot-wide tree-lined boulevard running from 24th Street in Upland south to Philadelphia Street in Ontario, San Bernardino County, California. It was laid out in 1882 by the Chaffey brothers as the centerpiece of the Ontario Irrigation Colony.","why_significant":"The nomination argues the avenue is the best physical example of the planning ideas of George and W.B. Chaffey and their Mutual Water Company model for agricultural colonies, which was later used in Australia. It is cited under community planning and development, social history and landscape architecture. It has also been the center of community events since 1882 and appears in the city seals of Ontario and Upland.","narrative":"Euclid Avenue is a 200-foot-wide boulevard running about 8.4 miles from the foothills of Mount Baldy at 24th Street in Upland to Philadelphia Street in Ontario. Laid out in 1882 and first planted in 1883, it has two 55-foot drives, a 60-foot landscaped median of California pepper trees, and parkways lined with silk oaks. It was the spine of the Ontario Irrigation Colony, created by brothers George and W.B. Chaffey, and underground pipes beneath it carried water to the colony's parcels. The nomination presents the colony and its Mutual Water Company system as a model for agricultural communities, later copied in Australia. Charles Frankish extended the avenue in 1886. Contributing features include the roadway, the landscape, the Madonna of the Trail monument and two relocated fountains. Several reconstructed items, such as the bandstand and veterans memorial, do not contribute. Freeway and railroad underpasses have altered parts of the route, but the original design remains largely intact.","period_of_significance":"1882-1940","architect_builder":"Chaffey, George Jr. & William Benjamin (W.B.) Chaffey; Frankish, Charles","architectural_style":"No style","criteria":["A","C"],"status_note":"Still an active state highway and landscaped boulevard. Alterations include freeway and railroad underpasses, replaced curbs and lampposts, and replacement trees, but the nomination says integrity is retained.","vacant_flag":false,"machine_generated":true,"model":"claude-sonnet-5-5","prompt_version":"v1.0-2026-10-29","generated_at":"2026-10-29 02:54:29.78793-05","source_pdf":"https://s3.amazonaws.com/NARAprodstorage/lz/electronic-records/rg-079/NPS_CA/05000843.pdf"},"photo":{"url_800":"https://nationalhistoricalregister.com/media/05000843/d7d5b11cdc-800.webp","url_1600":"https://nationalhistoricalregister.com/media/05000843/d7d5b11cdc-1600.webp","licence":"Public domain","author":null,"credit_html":"Unknown author, Public domain, via Wikimedia Commons","source_page":"https://commons.wikimedia.org/wiki/File:Ontario-1885.jpg"},"district":null,"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":"https://catalog.archives.gov/id/123860747","wikipedia":null,"wikidata":"https://www.wikidata.org/wiki/Q108145013"},"indexable":true,"url":"https://nationalhistoricalregister.com/california/san-bernardino-county/euclid-avenue-05000843/"}