{"nrhp_refnum":"68000022","name":"San Francisco Bay Discovery Site","other_names":[],"category":"site","location":{"address":"4 mi. W of San Bruno via Skyline Dr. and Sneath Lane","address_restricted":false,"city":"San Bruno","county":"San Mateo County","state":"CA","lat":37.60326582150006,"lon":-122.45606817606406,"geom_source":"nps_gis"},"listed_date":"1968-05-23","is_nhl":true,"nhl_designated_date":"1968-05-23","areas_of_significance":["Exploration/Settlement"],"significance_levels":["national"],"summary":{"what_it_is":"An 18.15-acre undeveloped site on Sweeney Ridge near Pacifica, San Mateo County, California, made up of two knolls where the Portola expedition first viewed San Francisco Bay in 1769.","why_significant":"The nomination argues the site marks the discovery of San Francisco Bay, described as the most important harbor on the Pacific Coast and a major event in establishing the Spanish presence in Alta California. The expedition under Captain Gaspar de Portola had been searching for Monterey Bay when it came upon the bay. The discovery led to later exploration and to the founding of a presidio and missions around the bay.","narrative":"Two knolls on Sweeney Ridge, above Pacifica in San Mateo County, mark the place where the Portola expedition first saw San Francisco Bay in 1769. The nominated area covers about 18.15 acres. No structures stand on it, and none are believed to have stood there before. From the ridge, a viewer can look inland over the bay and north along the coast toward Point Reyes, although industrial and residential development has altered the view. Captain Gaspar de Portola and about sixty men had traveled overland from San Diego looking for Monterey Bay and had not recognized it. After camping in Pedro Valley, the party climbed into the hills on November 4, 1769, and saw the great estuary. The nomination calls the bay the most important harbor on the Pacific Coast and ties its discovery to the Spanish establishment of Alta California. Later expeditions explored the area, and a presidio and missions followed around the bay.","period_of_significance":"1769","architect_builder":null,"architectural_style":null,"criteria":[],"status_note":"No structures are on the site. The form lists condition as good and original site, and the land is used for cattle grazing, though the view has changed with urban development around the bay.","vacant_flag":null,"machine_generated":true,"model":"claude-sonnet-5-5","prompt_version":"v1.0-2026-10-29","generated_at":"2026-10-29 02:55:31.468033-05","source_pdf":"https://s3.amazonaws.com/NARAprodstorage/lz/electronic-records/rg-079/NPS_CA/68000022_NHL.pdf"},"photo":{"url_800":"https://nationalhistoricalregister.com/media/68000022/e1e48c5c29-800.webp","url_1600":"https://nationalhistoricalregister.com/media/68000022/e1e48c5c29-1600.webp","licence":"CC BY-SA 2.0","author":"Panegyrics of Granovetter from Lincoln, NE, USA","credit_html":"<a href=\"https://commons.wikimedia.org/wiki/File:San_Francisco_Bay_Discovery_Site_vista_(2009).jpg\" rel=\"noopener\">Panegyrics of Granovetter from Lincoln, NE, USA</a>, <a href=\"https://creativecommons.org/licenses/by-sa/2.0\" rel=\"license noopener\">CC BY-SA 2.0</a>, via Wikimedia Commons","source_page":"https://commons.wikimedia.org/wiki/File:San_Francisco_Bay_Discovery_Site_vista_(2009).jpg"},"district":null,"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":"https://catalog.archives.gov/id/123858084","wikipedia":"https://en.wikipedia.org/wiki/San_Francisco_Bay_Discovery_Site","wikidata":"https://www.wikidata.org/wiki/Q7413934"},"indexable":true,"url":"https://nationalhistoricalregister.com/california/san-mateo-county/san-francisco-bay-discovery-site-68000022/"}