{"nrhp_refnum":"89001515","name":"Linden Street Bridge","other_names":[],"category":"structure","location":{"address":"Boston & Maine Railroad over Linden St.","address_restricted":false,"city":"Waltham","county":"Middlesex County","state":"MA","lat":42.38015338400004,"lon":-71.22039397899994,"geom_source":"nps_gis"},"listed_date":"1989-09-28","is_nhl":false,"nhl_designated_date":null,"areas_of_significance":["Community Planning and Development","Architecture"],"significance_levels":["local"],"summary":{"what_it_is":"A single-span steel riveted lattice through truss railroad bridge carrying the former Central Massachusetts Railroad line over Linden Street in Waltham, Massachusetts, built in 1894 and fabricated by the Pennsylvania Steel Company.","why_significant":"It is one of only three remaining riveted lattice through truss bridges of its type in Massachusetts, modeled on the Central Mass. Railroad's landmark nine-span lattice truss over the Connecticut River. It also reflects the growth in traffic on the line between 1887 and 1900 after the Boston & Maine Railroad acquired it.","narrative":"Carrying a single railroad track over Linden Street in Waltham at a 63-degree skew, this steel bridge was built in 1894 for the Central Massachusetts Railroad line, then under Boston & Maine control. It measures about 98 feet 3 inches long and 17 feet wide, with an inside truss height near 22 feet. The Pennsylvania Steel Company of Steelton, Pennsylvania, fabricated the riveted lattice through truss. Its granite abutments date from 1881 and supported an earlier bridge on the site. The design follows the railroad's landmark nine-span lattice truss over the Connecticut River at Northampton. The bridge is one of only three of its type left in Massachusetts and reflects the line's heavy traffic and upgrading between 1887 and 1900. Passenger service ended in 1975, and freight followed soon after. A state transit survey ranked the bridge in its top category, and it was listed for its historical association and engineering design, with its original materials and workmanship intact.","period_of_significance":null,"architect_builder":"Pennsylvania Steel Co. (Steelton, PA), fabricator","architectural_style":"Riveted lattice through truss","criteria":["A","C"],"status_note":"Condition listed as good with no alterations; the inventory form lists it as out of service. Passenger service on the line ended in 1975.","vacant_flag":null,"machine_generated":true,"model":"claude-sonnet-5-5","prompt_version":"v1.0-2026-10-29","generated_at":"2026-10-29 02:13:01.956774-05","source_pdf":"https://s3.amazonaws.com/NARAprodstorage/opastorage/live/31/7919/63791931/content/electronic-records/rg-079/NPS_MA/89001515.pdf"},"photo":{"url_800":"https://nationalhistoricalregister.com/media/89001515/88d31a89f3-800.webp","url_1600":"https://nationalhistoricalregister.com/media/89001515/88d31a89f3-1600.webp","licence":"CC BY-SA 4.0","author":"User:Magicpiano","credit_html":"<a href=\"https://commons.wikimedia.org/wiki/File:WalthamMA_LindenStreetBridge.jpg\" rel=\"noopener\">User:Magicpiano</a>, <a href=\"https://creativecommons.org/licenses/by-sa/4.0\" rel=\"license noopener\">CC BY-SA 4.0</a>, via Wikimedia Commons","source_page":"https://commons.wikimedia.org/wiki/File:WalthamMA_LindenStreetBridge.jpg"},"district":null,"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":"https://catalog.archives.gov/id/63791931","wikipedia":"https://en.wikipedia.org/wiki/Linden_Street_Bridge","wikidata":"https://www.wikidata.org/wiki/Q6552356"},"indexable":true,"url":"https://nationalhistoricalregister.com/massachusetts/middlesex-county/linden-street-bridge-89001515/"}