{"nrhp_refnum":"99001321","name":"Carpenter's Flats Bridge","other_names":["Bin # 1005950"],"category":"structure","location":{"address":"NY 9 over AuSable R.","address_restricted":false,"city":"AuSable","county":"Clinton County","state":"NY","lat":44.55884025700004,"lon":-73.44861492299998,"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 two-lane steel Warren through truss highway bridge, built in 1941, that carries NYS Route 9 over the AuSable River in the Towns of AuSable and Peru, Clinton County, New York, about two miles north of AuSable Chasm.","why_significant":"The bridge is described as an intact, well-preserved example of mid-20th century bridge engineering and construction. It is also significant for its role in regional transportation, carrying a major north-south highway through the eastern Adirondack and Lake Champlain region. It belongs to a multiple property group of historic AuSable River Valley bridges.","narrative":"Carrying NYS Route 9 over the AuSable River about two miles north of AuSable Chasm, this 255-foot steel Warren through truss bridge was built in 1941 by the American Bridge Company from plans by New York State Public Works Department engineers. Its riveted steel members, concrete abutments and two lanes reflect a standard design of the period. Until 1913 the broad, shallow river here was crossed only by a ford. The AuSable Chasm Company paid for a first bridge that year, expecting more automobile tourists. By the 1930s, rising car and truck traffic led to a replacement. Route 9 was a main north-south road through the eastern Adirondack and Lake Champlain region until Interstate 87 opened in 1967. The bridge was altered in 1994 with new railings, floor beams and a concrete deck, yet retains a high level of integrity. It is significant for its transportation role and as a well-preserved example of mid-20th century engineering.","period_of_significance":"1941-1948","architect_builder":"American Bridge Company (fabricator and builder); plans prepared by engineers at the New York State Public Works Department","architectural_style":"Warren steel truss bridge (Warren through truss with polygonal top chord)","criteria":["A","C"],"status_note":"Still carries vehicular traffic as a transportation use; altered in 1994 with new railings, steel floor beams and a reinforced concrete deck, and all existing metal sandblasted and painted. Described as retaining a high level of integrity.","vacant_flag":false,"machine_generated":true,"model":"claude-sonnet-5-5","prompt_version":"v1.0-2026-10-29","generated_at":"2026-10-29 02:51:51.367449-05","source_pdf":"https://s3.amazonaws.com/NARAprodstorage/lz/electronic-records/rg-079/NPS_NY/99001321.pdf"},"photo":{"url_800":"https://nationalhistoricalregister.com/media/99001321/8194769d41-800.webp","url_1600":"https://nationalhistoricalregister.com/media/99001321/8194769d41-1600.webp","licence":"CC BY-SA 3.0","author":"Mfwills","credit_html":"<a href=\"https://commons.wikimedia.org/wiki/File:Carpenter%27s_Flats_Bridge_Ausable_NY.JPG\" rel=\"noopener\">Mfwills</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:Carpenter%27s_Flats_Bridge_Ausable_NY.JPG"},"district":null,"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":"https://catalog.archives.gov/id/75312355","wikipedia":"https://en.wikipedia.org/wiki/Carpenter%27s_Flats_Bridge","wikidata":"https://www.wikidata.org/wiki/Q5045653"},"indexable":true,"url":"https://nationalhistoricalregister.com/new-york/clinton-county/carpenters-flats-bridge-99001321/"}