{"nrhp_refnum":"74002197","name":"Jarrot, Nicholas, Mansion","other_names":[],"category":"building","location":{"address":"124 E. First St.","address_restricted":false,"city":"Cahokia","county":"St. Clair County","state":"IL","lat":38.57000469500008,"lon":-90.18755363899999,"geom_source":"nps_gis"},"listed_date":"1974-11-19","is_nhl":true,"nhl_designated_date":"2001-08-07","areas_of_significance":["Exploration/Settlement","Architecture"],"significance_levels":["national"],"summary":{"what_it_is":"A brick residence at 1st Street and U.S. Route 50 in Cahokia, St. Clair County, Illinois, begun in 1799 and finished in 1806 for Major Nicholas Jarrot. It is now owned by the county historical society and used as a museum.","why_significant":"The nomination calls it the earliest known house still standing in Illinois and one of the oldest in the Mississippi Valley. Its design draws on 18th-century tidewater types, which is rare in Illinois, and shows the wealth and refinement of the French settlers. It is also tied to early settlers and well-known visitors.","narrative":"Begun in 1799 and completed in 1806, this brick house in Cahokia, Illinois, was built for Major Nicholas Jarrot, a French-born settler who arrived in the region in the 1790s. It rests on a rectangular plan of 33 by 51 feet, with solid brick walls laid in Flemish bond across the front and common bond on the sides and rear. Inside, a central hall with a period staircase and fireplace divides the ground floor, and a ballroom reportedly ran across the upstairs front. Black walnut was used for structural members and trim. The house has been altered over time, including several different front porches and a restoration by Guy Study after 1945. It survived three earthquakes and many floods. The nomination describes it as the earliest known house still standing in Illinois, notable for its refined tidewater-based style and its links to early settlers and travelers. It now operates as a museum.","period_of_significance":"18th Century (specific date 1799)","architect_builder":"Nicholas Jarrot (original owner and builder); later restoration by Guy Study after 1945","architectural_style":"Tidewater-type design of the 18th century, with later Classic Revival porch","criteria":[],"status_note":"Listed in fair condition, altered, on its original site; occupied and used as a museum, owned by the St. Clair County Historical Society.","vacant_flag":false,"machine_generated":true,"model":"claude-sonnet-5-5","prompt_version":"v1.0-2026-10-29","generated_at":"2026-10-29 02:55:34.686609-05","source_pdf":"https://s3.amazonaws.com/NARAprodstorage/opastorage/live/36/8941/28894136/content/electronic-records/rg-079/NPS_IL/74002197.pdf"},"photo":{"url_800":"https://nationalhistoricalregister.com/media/74002197/cddfe51c49-800.webp","url_1600":"https://nationalhistoricalregister.com/media/74002197/cddfe51c49-1600.webp","licence":"CC BY-SA 3.0","author":"Rklawton","credit_html":"<a href=\"https://commons.wikimedia.org/wiki/File:Jarrot_Mansion.JPG\" rel=\"noopener\">Rklawton</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:Jarrot_Mansion.JPG"},"district":null,"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":"https://catalog.archives.gov/id/28894136","wikipedia":"https://en.wikipedia.org/wiki/Nicholas_Jarrot_Mansion","wikidata":"https://www.wikidata.org/wiki/Q7025653"},"indexable":true,"url":"https://nationalhistoricalregister.com/illinois/st-clair-county/jarrot-nicholas-mansion-74002197/"}