{"nrhp_refnum":"99001323","name":"Stone Arch Bridge","other_names":["Bin #3-35002-0"],"category":"structure","location":{"address":"Main St. over AuSable R.","address_restricted":false,"city":"Keeseville","county":"Clinton County","state":"NY","lat":44.50525652600004,"lon":-73.48068139899993,"geom_source":"nps_gis"},"listed_date":"1999-11-12","is_nhl":false,"nhl_designated_date":null,"areas_of_significance":["Transportation","Engineering"],"significance_levels":["state"],"summary":{"what_it_is":"A two-lane stone masonry arch bridge carrying Main Street over the AuSable River in the village of Keeseville, Clinton and Essex Counties, New York. It was built in 1842-1843 with a 110-foot span, and the builder was master mason Solomon Townsend.","why_significant":"The bridge is an early, well-preserved example of mid-19th century stone masonry bridge construction, notable for a 110-foot span that was unusual for its time. It also shaped the pattern of community growth in Keeseville and tied together the village's social and economic life. It carried several regional highway routes for most of its life.","narrative":"Spanning the AuSable River at the center of Keeseville, New York, this two-lane stone arch bridge carries Main Street between Clinton and Essex Counties. Local sandstone with limestone voussoirs was used to build it in 1842-1843, and its single arch reaches 110 feet, an unusually long span for a bridge of that era. Master mason Solomon Townsend was the builder. During construction the partly finished arch collapsed into the river after a sudden storm, but Townsend rebuilt it and the keystone was set in 1843. The bridge replaced earlier wooden crossings that were vulnerable to floods. It served as a focal point for the village's growth and for decades carried NYS Routes 9, 22 and 9N, until a new bridge opened downstream in 1958 and it was left to local traffic. Alterations are limited to modern railing posts and resurfaced roadway and sidewalks. The American Society of Civil Engineers named it a National Historic Civil Engineering Landmark in 1987.","period_of_significance":"1843-1948","architect_builder":"Builder: Solomon Townsend","architectural_style":"OTHER: Stone Arch Bridge","criteria":["A","C"],"status_note":"Retains much of its original appearance and is in reasonably good condition, with minor damage from a November 1996 flood. Still used for local traffic after a new bridge took through traffic in 1958.","vacant_flag":false,"machine_generated":true,"model":"claude-sonnet-5-5","prompt_version":"v1.0-2026-10-29","generated_at":"2026-10-29 02:51:50.599388-05","source_pdf":"https://s3.amazonaws.com/NARAprodstorage/lz/electronic-records/rg-079/NPS_NY/99001323.pdf"},"photo":{"url_800":"https://nationalhistoricalregister.com/media/99001323/fd1525b729-800.webp","url_1600":"https://nationalhistoricalregister.com/media/99001323/fd1525b729-1600.webp","licence":"Public domain","author":"Marcbela (Marc N. Belanger)","credit_html":"<a href=\"https://commons.wikimedia.org/wiki/File:Keeseville_Stone_Bridge.jpg\" rel=\"noopener\">Marcbela (Marc N. Belanger)</a>, Public domain, via Wikimedia Commons","source_page":"https://commons.wikimedia.org/wiki/File:Keeseville_Stone_Bridge.jpg"},"district":{"nrhp_refnum":"83001666","name":"Keeseville Historic District","url":"https://nationalhistoricalregister.com/districts/new-york/keeseville-historic-district-83001666/"},"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":"https://catalog.archives.gov/id/75312365","wikipedia":"https://en.wikipedia.org/wiki/Stone_Arch_Bridge_(Keeseville,_New_York)","wikidata":"https://www.wikidata.org/wiki/Q7618860"},"indexable":true,"url":"https://nationalhistoricalregister.com/new-york/clinton-county/stone-arch-bridge-99001323/"}