{"nrhp_refnum":"98001538","name":"Grant Mills Covered Bridge","other_names":[],"category":"structure","location":{"address":"Mill Brook Rd., over Mill Brook","address_restricted":false,"city":"Hardenbergh","county":"Ulster County","state":"NY","lat":42.080103002000044,"lon":-74.62868062099994,"geom_source":"nps_gis"},"listed_date":"1998-12-17","is_nhl":false,"nhl_designated_date":null,"areas_of_significance":["Transportation","Engineering"],"significance_levels":["local"],"summary":{"what_it_is":"A single-span, gable-roofed covered timber highway bridge over Mill Brook on Mill Brook Road in Hardenbergh, Ulster County, New York, built in 1902 by Edgar A. Marks and his son Orrin B. Marks.","why_significant":"The nomination argues it is a rare, substantially intact example of rural vernacular bridge design and construction in the Catskill region. It uses the patented Town lattice truss and is a late example of that type, showing timber construction persisting into the early automobile age. It is described as one of only ten Town lattice truss covered timber bridges surviving in New York State.","narrative":"Spanning Mill Brook in the western Catskills, this covered timber bridge was built in 1902 to carry Mill Brook Road in the town of Hardenbergh. Local timber framer and sawyer Edgar A. Marks won the contract, hauled the stone for the abutments, and sawed the planks with help from his son Orrin and other local craftsmen. The span opened to traffic on December 8, 1902. It measures about 69 feet long and uses the Town lattice truss, with paired planks joined by wooden pins, resting on dry-laid fieldstone abutments. The road was realigned in 1964, leaving the bridge bypassed beside the modern route. Descendants of the builder restored it from 1990 to 1992, repairing the trusses, resheathing the walls and adding a new roof. It is valued as a rare and largely intact example of vernacular engineering, built by local craftsmen from native materials, and as one of only ten Town lattice covered bridges remaining in New York State.","period_of_significance":"1902","architect_builder":"Edgar Marks, Orrin B. Marks","architectural_style":"No style","criteria":["A","C"],"status_note":"Removed from service in 1964 when Mill Brook Road was realigned; restored 1990-1992 for pedestrian use and maintained as a local historic landmark by the town. Current function listed as vacant/not in use.","vacant_flag":true,"machine_generated":true,"model":"claude-sonnet-5-5","prompt_version":"v1.0-2026-10-29","generated_at":"2026-10-29 02:51:50.465181-05","source_pdf":"https://s3.amazonaws.com/NARAprodstorage/lz/electronic-records/rg-079/NPS_NY/98001538.pdf"},"photo":{"url_800":"https://nationalhistoricalregister.com/media/98001538/b9fbbda436-800.webp","url_1600":"https://nationalhistoricalregister.com/media/98001538/b9fbbda436-1600.webp","licence":"CC BY-SA 3.0","author":"Daniel Case","credit_html":"<a href=\"https://commons.wikimedia.org/wiki/File:Grant_Mills_Covered_Bridge.jpg\" rel=\"noopener\">Daniel Case</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:Grant_Mills_Covered_Bridge.jpg"},"district":null,"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":"https://catalog.archives.gov/id/75322622","wikipedia":"https://en.wikipedia.org/wiki/Grants_Mills_Bridge","wikidata":"https://www.wikidata.org/wiki/Q5596677"},"indexable":true,"url":"https://nationalhistoricalregister.com/new-york/ulster-county/grant-mills-covered-bridge-98001538/"}