{"nrhp_refnum":"81000712","name":"Boca Dam","other_names":[],"category":"structure","location":{"address":"S end of Boca Resevoir","address_restricted":false,"city":"Truckee","county":"Nevada County","state":"CA","lat":39.390450472000055,"lon":-120.09426547299995,"geom_source":"nps_gis"},"listed_date":"1981-03-25","is_nhl":false,"nhl_designated_date":null,"areas_of_significance":["Agriculture","Conservation","Engineering"],"significance_levels":["national"],"summary":{"what_it_is":"Boca Dam is a zoned earthfill dam on the Little Truckee River, within a mile of its junction with the Truckee River and about seven miles east of Truckee, California. It was built between 1937 and 1939.","why_significant":"The excerpt does not give a full statement of significance. The dam is part of the Newlands Reclamation Project thematic group, stores water for the Truckee Storage Project near Reno and for the Newlands Project, and is nominated alongside other related dams and works.","narrative":"Boca Dam is a zoned earthfill dam on the Little Truckee River in Nevada County, California, within a mile of the river's junction with the Truckee River and about seven miles east of the town of Truckee. Built between 1937 and 1939, it is 100 feet high with a crest 1,629 feet long and contains roughly 912,000 cubic yards of fill. A 40-foot-wide spillway can discharge 8,000 cubic feet per second, and a concrete-lined tunnel in the right abutment feeds slide gates, steel outlet pipes and needle valves. The reservoir stores water mainly for the Truckee Storage Project around Reno and also supports the Newlands Project. The dam is included within the Newlands Reclamation thematic group of dams and related works in the region, which also covers structures such as Lahontan Dam and the Derby Diversion Dam. The proposed boundary covers about 80 acres around the dam.","period_of_significance":null,"architect_builder":null,"architectural_style":null,"criteria":[],"status_note":"The dam is described as storing water for the Truckee Storage Project and the Newlands Project.","vacant_flag":null,"machine_generated":true,"model":"claude-sonnet-5-5","prompt_version":"v1.0-2026-10-29","generated_at":"2026-10-29 02:55:31.438663-05","source_pdf":"https://s3.amazonaws.com/NARAprodstorage/lz/electronic-records/rg-079/NPS_CA/81000712.pdf"},"photo":{"url_800":"https://nationalhistoricalregister.com/media/81000712/eb9410d279-800.webp","url_1600":"https://nationalhistoricalregister.com/media/81000712/eb9410d279-1600.webp","licence":"Public domain","author":"U.S. Bureau of Reclamation, photographer not specified or not known","credit_html":"<a href=\"https://commons.wikimedia.org/wiki/File:Boca_Dam2.jpg\" rel=\"noopener\">U.S. Bureau of Reclamation, photographer not specified or not known</a>, Public domain, via Wikimedia Commons","source_page":"https://commons.wikimedia.org/wiki/File:Boca_Dam2.jpg"},"district":null,"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":"https://catalog.archives.gov/id/123857702","wikipedia":"https://en.wikipedia.org/wiki/Boca_Dam","wikidata":"https://www.wikidata.org/wiki/Q4936083"},"indexable":true,"url":"https://nationalhistoricalregister.com/california/nevada-county/boca-dam-81000712/"}