{"nrhp_refnum":"96001113","name":"State Highway 27 Bridge at Johnson Fork","other_names":["I-10 Bridge at Johnson Fork","Km0142-01-035"],"category":"structure","location":{"address":"I-10, .6 mi. W of jct. with FM 2169","address_restricted":false,"city":"Junction","county":"Kimble County","state":"TX","lat":30.42587525700003,"lon":-99.67904094299996,"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 666-foot steel Parker through truss highway bridge over Johnson Fork near Segovia, about eight miles southeast of Junction, Kimble County, Texas. It was built in 1937-1938 on former State Highway 27 and now carries the northbound I-10 frontage road.","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 T24-120 standard design, one of 25 Parker through truss designs, and is one of only two surviving examples of the design's second version. Its combination of pier types is also unique.","narrative":"Spanning Johnson Fork near Segovia in Kimble County, this 666-foot steel bridge combines two 120-foot Parker through truss spans with eight steel I-beam approach spans, all carried on concrete piers and abutments. The Texas Highway Department designed it, Mosher Steel Company fabricated the steel, and Word & Worrell of San Antonio built it between July 1937 and April 1938 as part of a seven-mile realignment of State Highway 27 between Junction and Segovia. The project cost nearly $128,000, with about $62,000 coming from federal funds. The truss spans follow the department's T24-120 standard design, one of 25 Parker truss designs, and this bridge is one of only two surviving examples of the design's later version. Its mix of pier types is also unusual. When Interstate 10 was built in 1967-1969, new concrete bridges took the main traffic lanes, and the older truss remained in use on the northbound frontage road, preserving it in place.","period_of_significance":"1937-1938","architect_builder":"Bridge Designer: Texas Highway Department; Truss Fabricator: Mosher Steel Company of Houston, Texas; Bridge Builder: Word & Worrell of San Antonio, Texas","architectural_style":"Other: Parker through truss bridge","criteria":["C"],"status_note":"Remains in place serving vehicular traffic as the northbound I-10 frontage road; no major alterations since new main-lane bridges were built in 1967-1969.","vacant_flag":false,"machine_generated":true,"model":"claude-sonnet-5-5","prompt_version":"v1.0-2026-10-29","generated_at":"2026-10-29 02:54:23.222801-05","source_pdf":"https://s3.amazonaws.com/NARAprodstorage/opastorage/live/68/9697/40969768/content/electronic-records/rg-079/NPS_TX/96001113.pdf"},"photo":{"url_800":"https://nationalhistoricalregister.com/media/96001113/b3b4221dfa-800.webp","url_1600":"https://nationalhistoricalregister.com/media/96001113/b3b4221dfa-1600.webp","licence":"CC BY-SA 4.0","author":"JERRYE &amp; ROY KLOTZ M.D.","credit_html":"<a href=\"https://commons.wikimedia.org/wiki/File:STATE_HIGHWAY_27_BRIDGE_AT_JOHNSON_FORK,_JUNCTION,_KIMBLE_COUNTY,_TX.jpg\" rel=\"noopener\">JERRYE &amp;amp; ROY KLOTZ M.D.</a>, <a href=\"https://creativecommons.org/licenses/by-sa/4.0\" rel=\"license noopener\">CC BY-SA 4.0</a>, via Wikimedia Commons","source_page":"https://commons.wikimedia.org/wiki/File:STATE_HIGHWAY_27_BRIDGE_AT_JOHNSON_FORK,_JUNCTION,_KIMBLE_COUNTY,_TX.jpg"},"district":null,"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":"https://catalog.archives.gov/id/40969768","wikipedia":null,"wikidata":"https://www.wikidata.org/wiki/Q110001261"},"indexable":true,"url":"https://nationalhistoricalregister.com/texas/kimble-county/state-highway-27-bridge-at-johnson-fork-96001113/"}