{"nrhp_refnum":"86000018","name":"Seventh Street Bridge","other_names":[],"category":"structure","location":{"address":"Allegheny River at Seventh St.","address_restricted":false,"city":"Pittsburgh","county":"Allegheny County","state":"PA","lat":40.44771856600005,"lon":-80.00299035299997,"geom_source":"nps_gis"},"listed_date":"1986-01-07","is_nhl":false,"nhl_designated_date":null,"areas_of_significance":["Engineering","Transportation","Politics/Government"],"significance_levels":["national"],"summary":{"what_it_is":"The Seventh Street Bridge is a steel self-anchored suspension bridge with eyebar catenaries, crossing the Allegheny River in Pittsburgh, Allegheny County, Pennsylvania, linking downtown and the North Side. It was erected in 1925-26 by Allegheny County.","why_significant":"The form argues the bridge is significant as one of the first self-anchored suspension bridges in the United States, with the Sixth and Ninth Street Bridges. It is described as the only important surviving example of the eyebar suspension bridge in the country and the nation's only trio of virtually identical spans. It was built under a large county public works program of the 1920s and 1930s.","narrative":"Spanning the Allegheny River between downtown Pittsburgh and the North Side, the Seventh Street Bridge is a steel self-anchored suspension bridge completed in 1925-26 by Allegheny County. Its two stone-faced towers carry eyebar catenaries that are pinned at the towers, anchored at the shoreline piers, and tied to the deck with thin eyebar suspenders. The bridge is 1061 feet long, with a center span of 442 feet, and its deck is stiffened by triple web plate girders. It replaced an 1884 bridge designed by Gustav Lindenthal on the same site. It was built as part of a county program of bridge and highway construction begun in 1924. Its importance rests on its design: the stiffening girder resists the cable pull, so no anchorages were needed on the shoreline. The form treats it as the only major surviving eyebar suspension bridge in the country, and one of three nearly identical spans built together.","period_of_significance":"1925-26","architect_builder":"Vernon R. Covell et al. (engineer); Stanley Roush (architect); The Foundation Co. (contractor); American Bridge Co. (contractor)","architectural_style":"Suspension Bridge (self-anchored)","criteria":["C"],"status_note":"Condition recorded as good with excellent integrity on the survey form.","vacant_flag":null,"machine_generated":true,"model":"claude-haiku-5-5","prompt_version":"v1.1-2026-10-29","generated_at":"2026-10-29 17:11:32.170754-05","source_pdf":"https://s3.amazonaws.com/NARAprodstorage/lz/electronic-records/rg-079/NPS_PA/86000018.pdf"},"photo":{"url_800":"https://nationalhistoricalregister.com/media/86000018/075ac2eac2-800.webp","url_1600":"https://nationalhistoricalregister.com/media/86000018/075ac2eac2-1600.webp","licence":"CC BY-SA 3.0","author":"TheZachMorrisExperience","credit_html":"<a href=\"https://commons.wikimedia.org/wiki/File:AndyWarholBridgePittsburgh.JPG\" rel=\"noopener\">TheZachMorrisExperience</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:AndyWarholBridgePittsburgh.JPG"},"district":null,"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":"https://catalog.archives.gov/id/71992232","wikipedia":"https://en.wikipedia.org/wiki/Andy_Warhol_Bridge","wikidata":"https://www.wikidata.org/wiki/Q4761451"},"indexable":true,"url":"https://nationalhistoricalregister.com/pennsylvania/allegheny-county/seventh-street-bridge-86000018/"}