{"nrhp_refnum":"00000399","name":"Allegheny River Locka and Dam No. 5","other_names":[],"category":"structure","location":{"address":"830 River Rd.","address_restricted":false,"city":"Freeport","county":"Armstrong County","state":"PA","lat":40.68587045800007,"lon":-79.66627105154431,"geom_source":"nps_gis"},"listed_date":"2000-04-21","is_nhl":false,"nhl_designated_date":null,"areas_of_significance":["Transportation","Maritime History","Architecture","Engineering"],"significance_levels":["state"],"summary":{"what_it_is":"A navigation lock, dam, esplanade and operations building on the Allegheny River about one mile north of Freeport in Armstrong County, Pennsylvania, built by the U.S. Army Corps of Engineers in 1920-1927.","why_significant":"The nomination argues the facility is a representative example of lock and dam construction of the 1920-1927 period and an integral part of the Allegheny River slackwater navigation system, which gave commercial barge access to 72 miles of river. It states the lock and dam retain their original appearance, machinery and function and a high degree of integrity.","narrative":"Lock and Dam No. 5 sits on the Allegheny River about one mile north of Freeport, Pennsylvania. The U.S. Army Corps of Engineers built it between 1920 and 1927 to open slackwater navigation to sand and gravel pits upstream. The lock measures 56 by 360 feet and has an 11.6-foot lift, operated by hydraulic pistons. The dam is about 22 feet high and 632 feet long, with a concrete upper section set on stone-filled timber cribs. The operations building is a two-story rubber-roofed powerhouse of about 15 by 60 feet, with a rounded upstream end reflecting a vernacular version of the Moderne style. The dam was built by Dravo Construction Company, and the lock was built with Corps labor. The facility is regarded as a representative example of lock and dam construction of its period and as part of the Allegheny River Navigation System. Its machinery, layout and design remain largely original, and the 1937 reinforcements and later alterations are documented.","period_of_significance":"1920-1948","architect_builder":"Lock - Corps of Engineers; Dam - Dravo Construction Company","architectural_style":"Moderne","criteria":["A","C"],"status_note":"In use; the dam's hydroelectric generator continues to operate and the lock remains functional.","vacant_flag":false,"machine_generated":true,"model":"claude-haiku-5-5","prompt_version":"v1.1-2026-10-29","generated_at":"2026-10-29 17:11:36.131866-05","source_pdf":"https://s3.amazonaws.com/NARAprodstorage/lz/electronic-records/rg-079/NPS_PA/00000399.pdf"},"photo":{"url_800":"https://nationalhistoricalregister.com/media/00000399/e63d903cd2-800.webp","url_1600":"https://nationalhistoricalregister.com/media/00000399/e63d903cd2-1600.webp","licence":"CC BY-SA 3.0","author":"Generic1139","credit_html":"<a href=\"https://commons.wikimedia.org/wiki/File:Allegheny_River_Lock_and_Dam_No._5.jpg\" rel=\"noopener\">Generic1139</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:Allegheny_River_Lock_and_Dam_No._5.jpg"},"district":null,"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":"https://catalog.archives.gov/id/71992254","wikipedia":"https://en.wikipedia.org/wiki/Allegheny_River_Lock_and_Dam_No._5","wikidata":"https://www.wikidata.org/wiki/Q4731337"},"indexable":true,"url":"https://nationalhistoricalregister.com/pennsylvania/armstrong-county/allegheny-river-locka-and-dam-no-5-00000399/"}