{"nrhp_refnum":"04000173","name":"Lock and Dam No. 13 Historic District","other_names":[],"category":"district","location":{"address":"4999 Lock Rd.","address_restricted":false,"city":"Fulton","county":"Whiteside County","state":"IL","lat":41.90051529550007,"lon":-90.16023097037822,"geom_source":"nps_gis"},"listed_date":"2004-03-10","is_nhl":false,"nhl_designated_date":null,"areas_of_significance":["Transportation","Maritime History","Commerce","Conservation","Politics/Government","Economics","Social History","Military"],"significance_levels":["national"],"summary":{"what_it_is":"A 254-acre federal navigation complex on the Upper Mississippi River near Fulton, Whiteside County, Illinois, consisting of a lift lock, a nonnavigable dam, a control station and associated dikes. Most of it was built between 1935 and 1939 by the Corps of Engineers.","why_significant":"It is a good example of the final stage of design evolution in the Upper Mississippi River 9-Foot Navigation Project. It also has an unusual feature: an 8,900-foot dike extending from the lock to the Illinois shore, making it the only complex in the project with part of its dam on the landward side of the main lock. The form ties its significance to transportation, commerce, conservation, military, politics, economics, maritime and social history.","narrative":"Lock and Dam No. 13 spans the Upper Mississippi River north of Clinton, Iowa, and Fulton, Illinois. The district covers about 254 acres and includes a lift lock with an 11-foot lift, an incomplete auxiliary lock, a dam with Tainter and roller gates, a brick control station and long earthen dikes. McCarthy Improvement Company built the lock by December 1936 and the dam by December 1938, and the complex opened to navigation on May 13, 1939. It was the 17th complex of the 9-Foot Navigation Project to go into service. Its significance rests on its role in that project and on one unusual feature: an 8,900-foot dike linking the lock to the Illinois shore, which makes it the only complex in the project with part of its dam on the landward side of the main lock. Upstream guide wall and mooring dike additions in 1942 and 1950 addressed outdraft problems. Later rehabilitation resurfaced the lock, but the form says the setting and overall character remain intact.","period_of_significance":"1935-1948","architect_builder":"McCarthy Improvement Company of Davenport, Iowa (lock and dam); Charles H. Langman of Rock Island, Illinois (temporary buildings); U.S. Army Corps of Engineers, Rock Island District","architectural_style":"Other: lock and dam; Moderne: control station; Other: machinery","criteria":[],"status_note":"In continuous use since May 13, 1939. The lock and dam were rehabilitated in 1993-1997, and the form describes the components as in excellent condition, though some original architectural details have been lost.","vacant_flag":false,"machine_generated":true,"model":"claude-sonnet-5-5","prompt_version":"v1.0-2026-10-29","generated_at":"2026-10-29 02:55:37.287314-05","source_pdf":"https://s3.amazonaws.com/NARAprodstorage/opastorage/live/82/8914/28891482/content/electronic-records/rg-079/NPS_IL/04000173.pdf"},"photo":{"url_800":"https://nationalhistoricalregister.com/media/04000173/114d7768f2-800.webp","url_1600":"https://nationalhistoricalregister.com/media/04000173/114d7768f2-1600.webp","licence":"Public domain","author":"US Army Corps of Engineers, photographer unknown","credit_html":"US Army Corps of Engineers, photographer unknown, Public domain, via Wikimedia Commons","source_page":"https://commons.wikimedia.org/wiki/File:Mississippi_River_Lock_and_Dam_number_13.jpg"},"district":null,"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":"https://catalog.archives.gov/id/28891482","wikipedia":"https://en.wikipedia.org/wiki/Lock_and_Dam_No._13","wikidata":"https://www.wikidata.org/wiki/Q266350"},"indexable":true,"url":"https://nationalhistoricalregister.com/illinois/whiteside-county/lock-and-dam-no-13-historic-district-04000173/"}