{"nrhp_refnum":"85002352","name":"Green Valley Historic District","other_names":[],"category":"district","location":{"address":"Green Valley Rd.","address_restricted":false,"city":"Newlin & E. Marlborough Twps.","county":"Chester County","state":"PA","lat":39.92874058250007,"lon":-75.7575730478236,"geom_source":"nps_gis"},"listed_date":"1985-09-16","is_nhl":false,"nhl_designated_date":null,"areas_of_significance":["Industry","Exploration/Settlement"],"significance_levels":["local"],"summary":{"what_it_is":"The Green Valley Historic District is a rural district encompassing the drainage basin of Green Valley Creek, a tributary of the Brandywine's West Branch, running through East Marlborough and Newlin Townships in Chester County, Pennsylvania. It contains 13 principal buildings and several historic sites including lime quarries, kilns and two mill seats.","why_significant":"The district is significant for its well-preserved combination of natural landscape and 18th- and 19th-century farms, mills, lime production and a school. The document argues that its land and buildings look much as they did a century earlier, and that its integrity and sense of community are the basis for its significance.","narrative":"Green Valley is a rural district in Chester County, Pennsylvania, following the drainage basin of Green Valley Creek through East Marlborough and Newlin Townships. Settlement began with a few families in the 18th century, and in the 1860s the valley supported two grist mills, a saw mill, a Baptist church and burial ground, several lime quarries and kilns, and a one-room school built in 1862. Lime was used almost exclusively as a soil sweetener. The Green Valley Farm house, dating from about 1810, is a stone Georgian/Federal transitional building with a handsome all-stone barn. The William Hall house, built about 1795 of log, is a modest 18th-century example that retains its original interior features. Passmore Mill is the only one of the two mills still standing. Much of the valley remains open farmland, and it is valued for its intact landscape and buildings.","period_of_significance":"1700-1899","architect_builder":null,"architectural_style":"Georgian/Federal transitional","criteria":[],"status_note":"Agriculture remains an important activity; several mills, the school, church and lime quarries ceased operation and were converted or demolished.","vacant_flag":null,"machine_generated":true,"model":"claude-haiku-5-5","prompt_version":"v1.1-2026-10-29","generated_at":"2026-10-29 17:11:34.315404-05","source_pdf":"https://s3.amazonaws.com/NARAprodstorage/lz/electronic-records/rg-079/NPS_PA/85002352.pdf"},"photo":{"url_800":"https://nationalhistoricalregister.com/media/85002352/d89ad9c7a7-800.webp","url_1600":"https://nationalhistoricalregister.com/media/85002352/d89ad9c7a7-1600.webp","licence":"CC0","author":"Smallbones","credit_html":"<a href=\"https://commons.wikimedia.org/wiki/File:Green_Valley_Log_Cabin.JPG\" rel=\"noopener\">Smallbones</a>, <a href=\"http://creativecommons.org/publicdomain/zero/1.0/deed.en\" rel=\"license noopener\">CC0</a>, via Wikimedia Commons","source_page":"https://commons.wikimedia.org/wiki/File:Green_Valley_Log_Cabin.JPG"},"district":null,"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":"https://catalog.archives.gov/id/71992706","wikipedia":"https://en.wikipedia.org/wiki/Green_Valley_Historic_District","wikidata":"https://www.wikidata.org/wiki/Q5603376"},"indexable":true,"url":"https://nationalhistoricalregister.com/pennsylvania/chester-county/green-valley-historic-district-85002352/"}