{"nrhp_refnum":"99001317","name":"Delaware and Hudson Railroad Bridge","other_names":[],"category":"structure","location":{"address":"Over AuSable River northeast of Lakeside Rd.","address_restricted":false,"city":"AuSable","county":"Clinton County","state":"NY","lat":44.55553911700008,"lon":-73.43429874799995,"geom_source":"nps_gis"},"listed_date":"1999-11-12","is_nhl":false,"nhl_designated_date":null,"areas_of_significance":["Transportation","Engineering"],"significance_levels":["local"],"summary":{"what_it_is":"A pair of steel Warren through truss railroad bridges, about 100 feet apart on the same alignment, carrying the former Delaware & Hudson rail line over the Main Branch of the AuSable River in the towns of AuSable and Peru, Clinton County, New York. Both were built in 1913.","why_significant":"The bridges are significant as intact, well-preserved examples of early 20th century railroad bridge engineering and construction. They are also tied to the history of rail transportation along the Adirondack-Lake Champlain corridor, which has been the major north-south rail route in the region since 1913.","narrative":"Two steel railroad bridges cross the Main Branch of the AuSable River near its mouth at Lake Champlain, in the towns of AuSable and Peru, New York. Built in 1913 by the American Bridge Company, both are Warren through trusses with riveted steel channel, lattice and I-beam members on concrete abutments. The north bridge spans 156 feet and the south bridge 173 feet, and both carry cast-iron plaques dated 1913. They carry the former Delaware & Hudson line, which opened as a through route to Plattsburgh in 1875 and supported iron mining, manufacturing and tourism in the region. The bridges are valued as intact examples of a standard early 20th century railroad truss design that descends from mid-19th century iron Warren trusses. They also reflect the growth in locomotive weight, from about 40 tons in 1860 to 150 tons or more by 1910. No alterations are known, and the line remains in use for freight and Amtrak service.","period_of_significance":"1913-1948","architect_builder":"American Bridge Company","architectural_style":"Warren steel truss bridges (Warren through truss)","criteria":["A","C"],"status_note":"Still carries the rail line, now owned by Canadian-Pacific Railroad and used mainly for freight, with two Amtrak trips daily. No alterations are known and integrity is described as exceptionally high.","vacant_flag":false,"machine_generated":true,"model":"claude-sonnet-5-5","prompt_version":"v1.0-2026-10-29","generated_at":"2026-10-29 02:51:51.567661-05","source_pdf":"https://s3.amazonaws.com/NARAprodstorage/lz/electronic-records/rg-079/NPS_NY/99001317.pdf"},"photo":null,"district":null,"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":"https://catalog.archives.gov/id/75312353","wikipedia":"https://en.wikipedia.org/wiki/Delaware_and_Hudson_Railroad_Bridge_(Clinton_County,_New_York)","wikidata":"https://www.wikidata.org/wiki/Q5253433"},"indexable":true,"url":"https://nationalhistoricalregister.com/new-york/clinton-county/delaware-and-hudson-railroad-bridge-99001317/"}