{"nrhp_refnum":"86000020","name":"South Tenth Street Bridge","other_names":[],"category":"structure","location":{"address":"Monongahela River at S. Tenth St.","address_restricted":false,"city":"Pittsburgh","county":"Allegheny County","state":"PA","lat":40.43246561400008,"lon":-79.98942170699996,"geom_source":"nps_gis"},"listed_date":"1986-01-07","is_nhl":false,"nhl_designated_date":null,"areas_of_significance":["Transportation","Politics/Government","Architecture"],"significance_levels":["national"],"summary":{"what_it_is":"A steel wire-cable suspension bridge crossing the Monongahela River in Pittsburgh, Allegheny County, connecting the South Side with a narrow strip of riverfront land below The Bluff. It was built in 1931-32 and carries four traffic lanes with walkways on each side.","why_significant":"The nomination argues the bridge is significant for its transportation role at its site, as a product of a period of intensive bridge-building by Allegheny County, and as the county's only wire-cable suspension bridge. Its Moderne towers and visual lightness are also cited. It is part of the Allegheny County Owned River Bridges thematic group.","narrative":"Steel wire-cable suspension bridge carrying four lanes across the Monongahela River at the narrowest point of the river through Pittsburgh, linking the South Side with a narrow riverfront strip below The Bluff. Completed in 1931-32 under the Allegheny County Department of Public Works, which had launched an extensive bridge and highway program in 1924 funded by large bond issues. The central span is 725 feet, the width of the river at the site. Openwork steel towers with tapering uprights and a crossing-girder frieze give the bridge its Moderne character. The deck originally carried trolleys as well as other traffic, and walkways with decorative metalwork railings bow outward around the tower uprights. Vernon R. Covell, the county's chief engineer, is generally credited with the design, and County Architect Stanley Roush contributed to it. The bridge is regarded as the county's only wire-cable suspension bridge and is significant for its role in transportation and its place in the county's bridge-building campaign.","period_of_significance":"1921-1940","architect_builder":"Vernon R. Covell et al. (engineer); Stanley Roush (architect); American Bridge Co. (contractor)","architectural_style":"Moderne","criteria":["A","C"],"status_note":"Condition recorded as good on the form; in use for vehicular traffic as a bridge.","vacant_flag":false,"machine_generated":true,"model":"claude-haiku-5-5","prompt_version":"v1.1-2026-10-29","generated_at":"2026-10-29 17:11:33.404326-05","source_pdf":"https://s3.amazonaws.com/NARAprodstorage/lz/electronic-records/rg-079/NPS_PA/86000020.pdf"},"photo":{"url_800":"https://nationalhistoricalregister.com/media/86000020/b90ae02467-800.webp","url_1600":"https://nationalhistoricalregister.com/media/86000020/b90ae02467-1600.webp","licence":"Public domain","author":"PixOnTrax at English Wikipedia","credit_html":"<a href=\"https://commons.wikimedia.org/wiki/File:South_Tenth_Street_Bridge.jpg\" rel=\"noopener\">PixOnTrax at English Wikipedia</a>, Public domain, via Wikimedia Commons","source_page":"https://commons.wikimedia.org/wiki/File:South_Tenth_Street_Bridge.jpg"},"district":null,"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":"https://catalog.archives.gov/id/71992258","wikipedia":"https://en.wikipedia.org/wiki/South_Tenth_Street_Bridge","wikidata":"https://www.wikidata.org/wiki/Q7568623"},"indexable":true,"url":"https://nationalhistoricalregister.com/pennsylvania/allegheny-county/south-tenth-street-bridge-86000020/"}