{"nrhp_refnum":"96001115","name":"State Highway 89 Bridge at the Brazos River","other_names":["I-20 Br. at the Brazos River(n. frontage rd.)","Pr0314-01-006"],"category":"structure","location":{"address":"I-20, 1.7 mi. W of jct. with FM 113","address_restricted":false,"city":"Millsap","county":"Parker County","state":"TX","lat":32.666910984000026,"lon":-98.03337211799999,"geom_source":"nps_gis"},"listed_date":"1996-10-10","is_nhl":false,"nhl_designated_date":null,"areas_of_significance":["Engineering"],"significance_levels":["state"],"summary":{"what_it_is":"A steel Parker through truss highway bridge with concrete girder approach spans carrying a frontage road of Interstate 20 over the Brazos River near Millsap in southwest Parker County, Texas. It was built in 1933-1934 by Buckner Brothers to Texas Highway Department plans.","why_significant":"The bridge embodies the defining characteristics of a Texas Highway Department truss bridge, meeting Criterion C in Engineering at the state level. It uses the T24-165 standard design, one of 25 THD Parker through truss designs, and is the only surviving example of that design in Texas.","narrative":"Three 165-foot steel Parker through truss spans and eleven concrete girder approach spans carry a frontage road over the Brazos River in southwest Parker County, Texas. The bridge is 892 feet long and rests on concrete piers and bents. Buckner Brothers of Cleburne built it between December 1933 and September 1934 for the Texas Highway Department, which designed it as part of State Highway 89. Its trusses follow the department's T24-165 standard design, one of 25 Parker through truss designs developed by the Bridge Division, and it is the only surviving example of that design in Texas. When new bridges for Interstate 20 were built alongside in 1967-1970, the original was kept as a local two-way frontage road. Apart from patching of several bent caps in 1994, it has seen no major alterations and keeps substantial integrity. It was listed for its engineering significance at the state level.","period_of_significance":"1933-1934","architect_builder":"Bridge Designer: Texas Highway Department; Truss Fabricator: Houston Structural Steel Company, owned and operated by the Mosher Steel & Machinery Company of Dallas, Texas; Bridge Builder: Buckner Brothers of Cleburne, Texas","architectural_style":"Other: Parker through truss bridge","criteria":["C"],"status_note":"Still in vehicular use as a two-way, two-lane frontage road on I-20; only minor repairs to bent caps in 1994.","vacant_flag":false,"machine_generated":true,"model":"claude-sonnet-5-5","prompt_version":"v1.0-2026-10-29","generated_at":"2026-10-29 02:54:23.909608-05","source_pdf":"https://s3.amazonaws.com/NARAprodstorage/opastorage/live/23/9699/40969923/content/electronic-records/rg-079/NPS_TX/96001115.pdf"},"photo":{"url_800":"https://nationalhistoricalregister.com/media/96001115/453900e205-800.webp","url_1600":"https://nationalhistoricalregister.com/media/96001115/453900e205-1600.webp","licence":"CC BY-SA 3.0","author":"Renelibrary","credit_html":"<a href=\"https://commons.wikimedia.org/wiki/File:State_Highway_89_Bridge.jpg\" rel=\"noopener\">Renelibrary</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:State_Highway_89_Bridge.jpg"},"district":null,"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":"https://catalog.archives.gov/id/40969923","wikipedia":null,"wikidata":"https://www.wikidata.org/wiki/Q110001296"},"indexable":true,"url":"https://nationalhistoricalregister.com/texas/parker-county/state-highway-89-bridge-at-the-brazos-river-96001115/"}