{"nrhp_refnum":"88000867","name":"Liberty Bridge","other_names":[],"category":"structure","location":{"address":"Over the Monongahela River","address_restricted":false,"city":"Pittsburgh","county":"Allegheny County","state":"PA","lat":40.432801565000034,"lon":-79.99696203799994,"geom_source":"nps_gis"},"listed_date":"1988-06-22","is_nhl":false,"nhl_designated_date":null,"areas_of_significance":["Engineering","Transportation"],"significance_levels":["state"],"summary":{"what_it_is":"A multiple-span Pratt deck truss bridge crossing the Monongahela River in Pittsburgh, Allegheny County, Pennsylvania, completed in 1928. It carries a principal traffic route from south of the city into downtown.","why_significant":"The bridge is regarded as a very good example of a multiple-span Pratt deck truss and is the only deck truss in its group of Pennsylvania highway bridges. Its main spans are extremely long, and the riveted spans are heavily engineered. It also carries one of the principal traffic arteries into downtown Pittsburgh.","narrative":"Spanning the Monongahela River in Pittsburgh, this multiple-span Pratt deck truss bridge was completed in 1928. The Allegheny County Department of Public Works designed it, and Taylor & Dean built it. Its 2,663-foot length includes eight main spans of 470 feet each, carried on riveted members that are heavily engineered. It is regarded as a very good example of a multiple-span Pratt deck truss, and it is the only deck truss in its group of Pennsylvania highway bridges. The main spans are notably long for this type. The bridge also carries one of the principal traffic arteries from south of Pittsburgh into the downtown core, which gives it importance in transportation. Engineering and transportation are the areas of significance. A new deck was installed and the piers reconstructed in 1982, so part of the original fabric has been altered.","period_of_significance":null,"architect_builder":"V. R. Covell (designer/engineer); Taylor & Dean (builder/contractor)","architectural_style":null,"criteria":[],"status_note":"Altered in 1982 with a new deck and reconstruction of the piers.","vacant_flag":null,"machine_generated":true,"model":"claude-haiku-5-5","prompt_version":"v1.1-2026-10-29","generated_at":"2026-10-29 17:11:36.277781-05","source_pdf":"https://s3.amazonaws.com/NARAprodstorage/lz/electronic-records/rg-079/NPS_PA/88000867.pdf"},"photo":{"url_800":"https://nationalhistoricalregister.com/media/88000867/a79f4fac43-800.webp","url_1600":"https://nationalhistoricalregister.com/media/88000867/a79f4fac43-1600.webp","licence":"CC BY-SA 3.0","author":"Scillystuff at English Wikipedia","credit_html":"<a href=\"https://commons.wikimedia.org/wiki/File:Liberty_Bridge.jpg\" rel=\"noopener\">Scillystuff at English Wikipedia</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:Liberty_Bridge.jpg"},"district":null,"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":"https://catalog.archives.gov/id/71992226","wikipedia":"https://en.wikipedia.org/wiki/Liberty_Bridge_(Pittsburgh)","wikidata":"https://www.wikidata.org/wiki/Q6541627"},"indexable":true,"url":"https://nationalhistoricalregister.com/pennsylvania/allegheny-county/liberty-bridge-88000867/"}