{"nrhp_refnum":"71000954","name":"Fort Duncan","other_names":[],"category":"district","location":{"address":"Bounded by Monroe and Garrison Sts,. city limits on the S, and the Rio Grande on the W","address_restricted":false,"city":"Eagle Pass","county":"Maverick County","state":"TX","lat":28.70220516300003,"lon":-100.505150513587,"geom_source":"nps_gis"},"listed_date":"1971-12-09","is_nhl":false,"nhl_designated_date":null,"areas_of_significance":["Military"],"significance_levels":["state"],"summary":{"what_it_is":"Fort Duncan is a mid-nineteenth century frontier military post district on the east bank of the Rio Grande in Eagle Pass, Maverick County, Texas, established in 1849 and now owned by the city. It covers about 100 acres, including all the remaining buildings and most of the original reservation.","why_significant":"The nomination argues the fort is significant in military history as the fifth of the 1849 line of posts protecting the Texas frontier from Indians. It also guarded trade with Mexico crossing at Eagle Pass and the California road, served as a Confederate supply point for munitions from Mexico, and was where the Seminole-Negro Indian Scouts were organized in 1870. Its surviving stone buildings are typical frontier military architecture.","narrative":"Fort Duncan is a former U.S. Army post on the Rio Grande at Eagle Pass, Texas. Established on March 27, 1849, it was the fifth in a line of frontier forts meant to protect settlers from Indian attacks. It also watched over the Mexico trade crossing at Eagle Pass and the California road. The fort was given up in 1859, regarrisoned in 1860 during the Cortinas disturbances, and used as a Confederate supply point for munitions obtained in Mexico. Federal troops returned in 1868, and in 1870 the Seminole-Negro Indian Scouts were organized here. The post was reactivated in 1917 and finally abandoned in 1922. The city bought the land in 1938 and made it a park. The surviving buildings are load-bearing stone structures with rough ashlar walls, wood lintels and whitewashed surfaces. Their interiors have been altered, but they remain typical of mid-nineteenth century military construction on the frontier.","period_of_significance":"19th Century (specific date 1849)","architect_builder":null,"architectural_style":"Mid-nineteenth century frontier military architecture","criteria":[],"status_note":"Condition is rated fair and altered. Neglect after abandonment, Works Project Administration work and remodelling after the city's purchase changed the buildings. The property is a city-owned park with a museum, and a restoration group hopes to restore the old headquarters building as a museum.","vacant_flag":null,"machine_generated":true,"model":"claude-sonnet-5-5","prompt_version":"v1.0-2026-10-29","generated_at":"2026-10-29 02:54:18.945614-05","source_pdf":"https://s3.amazonaws.com/NARAprodstorage/opastorage/live/70/9729/40972970/content/electronic-records/rg-079/NPS_TX/71000954.pdf"},"photo":{"url_800":"https://nationalhistoricalregister.com/media/71000954/55b067a890-800.webp","url_1600":"https://nationalhistoricalregister.com/media/71000954/55b067a890-1600.webp","licence":"CC BY-SA 3.0","author":"Pi3.124","credit_html":"<a href=\"https://commons.wikimedia.org/wiki/File:Fort_Duncan_1887.jpg\" rel=\"noopener\">Pi3.124</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:Fort_Duncan_1887.jpg"},"district":null,"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":"https://catalog.archives.gov/id/40972970","wikipedia":"https://en.wikipedia.org/wiki/Fort_Duncan","wikidata":"https://www.wikidata.org/wiki/Q3077859"},"indexable":true,"url":"https://nationalhistoricalregister.com/texas/maverick-county/fort-duncan-71000954/"}