{"nrhp_refnum":"76001256","name":"Nine Mile Creek Aqueduct","other_names":[],"category":"structure","location":{"address":"NE of Camillus on Thompson Rd.","address_restricted":false,"city":"Camillus","county":"Onondaga County","state":"NY","lat":43.05893999800003,"lon":-76.28561235199999,"geom_source":"nps_gis"},"listed_date":"1976-05-17","is_nhl":false,"nhl_designated_date":null,"areas_of_significance":["Engineering","Transportation"],"significance_levels":["local"],"summary":{"what_it_is":"A four-arch stone aqueduct, 144 feet long, that carried the enlarged Erie Canal over Nine Mile Creek northeast of Camillus, Onondaga County, New York. It was built between 1841 and 1844 by contractors Denton and Cromwell.","why_significant":"The nomination calls it the largest second-class aqueduct on the enlarged Erie Canal and a well-preserved engineering and transportation landmark. Its completion removed the need for two high-lift locks on the Jordan Level, speeding westward traffic. Its survival is partly credited to hydraulic cement, first developed in the U.S. for Erie Canal masonry.","narrative":"Nine Mile Creek Aqueduct is a four-arch stone structure northeast of Camillus, New York, built between 1841 and 1844 to carry the enlarged Erie Canal across Nine Mile Creek. Each arch spans thirty feet, and the whole structure measures 144 feet. It was the largest second-class aqueduct on the enlarged canal. The design is attributed to engineer Frederick C. Mills, and the contract went to builders Denton and Cromwell. The aqueduct replaced a failing two-span structure and made two high-lift locks on the Jordan Level unnecessary, saving distance and repair costs. It remained in service until the old canal route was abandoned in 1918. The masonry is rough pointed stone in ashlar courses, mortared with hydraulic cement, which has helped it survive. The wooden trunk that held the water has disappeared, but the piers, towpath, parapet and curved wingwalls remain. The town of Camillus acquired the aqueduct in 1974 and planned an Erie Canal Park around it.","period_of_significance":"1800-1899","architect_builder":"Attributed to Frederick C. Mills (1804-1850); builders Denton and Cromwell","architectural_style":null,"criteria":[],"status_note":"Owned by the Town of Camillus Parks and Recreation Department since 1974 and planned as the focal point of a proposed Erie Canal Park. Masonry is generally sound; the original timber trunk is gone apart from a rotted section at the southeast end. Condition is marked good and unaltered.","vacant_flag":null,"machine_generated":true,"model":"claude-sonnet-5-5","prompt_version":"v1.0-2026-10-29","generated_at":"2026-10-29 02:50:39.165421-05","source_pdf":"https://s3.amazonaws.com/NARAprodstorage/lz/electronic-records/rg-079/NPS_NY/76001256.pdf"},"photo":{"url_800":"https://nationalhistoricalregister.com/media/76001256/8c136262d0-800.webp","url_1600":"https://nationalhistoricalregister.com/media/76001256/8c136262d0-1600.webp","licence":"CC BY-SA 3.0","author":"Lvklock","credit_html":"<a href=\"https://commons.wikimedia.org/wiki/File:Ninemile_Aqueduct_restoration.jpg\" rel=\"noopener\">Lvklock</a>, <a href=\"https://creativecommons.org/licenses/by-sa/3.0\" rel=\"license noopener\">CC BY-SA 3.0</a>, via Wikimedia Commons","source_page":"https://commons.wikimedia.org/wiki/File:Ninemile_Aqueduct_restoration.jpg"},"district":null,"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":"https://catalog.archives.gov/id/75320402","wikipedia":"https://en.wikipedia.org/wiki/Nine_Mile_Creek_Aqueduct","wikidata":"https://www.wikidata.org/wiki/Q14707104"},"indexable":true,"url":"https://nationalhistoricalregister.com/new-york/onondaga-county/nine-mile-creek-aqueduct-76001256/"}