{"nrhp_refnum":"96001112","name":"State Highway 3-A Bridge at Cibolo Creek","other_names":["I-10 Bridge at Cibolo Creek"],"category":"structure","location":{"address":"I-10 at the Bexar and Guadalupe Cnty. line","address_restricted":false,"city":"Schertz","county":"Bexar County","state":"TX","lat":29.50139457100005,"lon":-98.18671083299995,"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 bridge with six I-beam approach spans, carrying the eastbound frontage road of Interstate 10 (former State Highway 3-A) over Cibolo Creek on the Bexar and Guadalupe county line near Schertz, Texas. It was built in 1932-1933.","why_significant":"The bridge embodies the defining characteristics of a Texas Highway Department truss bridge and is significant in engineering at the state level. Its T24-120 truss design is the only surviving example of the first version of that design. The bridge also retains substantial integrity of design, materials and workmanship.","narrative":"This 434-foot bridge carries the eastbound frontage road of Interstate 10 over Cibolo Creek, the boundary between Bexar and Guadalupe counties near Schertz. It has a single 120-foot riveted Parker through truss span and six 52-foot steel I-beam approach spans, the outer beams encased in concrete, probably for appearance. The D.F. Jones Construction Company of Little Rock built it in 1932 and 1933 for the Texas Highway Department on the new State Highway 3-A route between San Antonio and Seguin. Houston Structural Steel fabricated the steel. The truss follows the department's T24-120 standard design, and this bridge is the only survivor of that design's first version. In the early 1960s two new I-beam bridges were built alongside to carry the main traffic lanes, which left the older bridge in service with few alterations. It retains substantial integrity and is recognized for its engineering significance at the state level.","period_of_significance":"1932-1933","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: D.F. Jones Construction Company of Little Rock, Arkansas","architectural_style":"Other: Parker through truss bridge","criteria":["C"],"status_note":"Remains in place serving vehicular traffic as the eastbound I-10 frontage road; no projects currently planned.","vacant_flag":false,"machine_generated":true,"model":"claude-sonnet-5-5","prompt_version":"v1.0-2026-10-29","generated_at":"2026-10-29 02:54:23.742745-05","source_pdf":"https://s3.amazonaws.com/NARAprodstorage/opastorage/live/30/9683/40968330/content/electronic-records/rg-079/NPS_TX/96001112.pdf"},"photo":{"url_800":"https://nationalhistoricalregister.com/media/96001112/c5826c7c0d-800.webp","url_1600":"https://nationalhistoricalregister.com/media/96001112/c5826c7c0d-1600.webp","licence":"CC BY-SA 3.0","author":"25or6to4","credit_html":"<a href=\"https://commons.wikimedia.org/wiki/File:State_Hwy_3A_bridge_Texas.jpg\" rel=\"noopener\">25or6to4</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_Hwy_3A_bridge_Texas.jpg"},"district":null,"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":"https://catalog.archives.gov/id/40968330","wikipedia":"https://en.wikipedia.org/wiki/State_Highway_3-A_Bridge_at_Cibolo_Creek","wikidata":"https://www.wikidata.org/wiki/Q7603284"},"indexable":true,"url":"https://nationalhistoricalregister.com/texas/bexar-county/state-highway-3-a-bridge-at-cibolo-creek-96001112/"}