{"nrhp_refnum":"79000305","name":"Lock No. 29 and Aqueduct","other_names":["Peninsula Lock"],"category":"structure","location":{"address":"off SR 303","address_restricted":false,"city":"Peninsula","county":"Summit County","state":"OH","lat":41.242814416000044,"lon":-81.55047147099998,"geom_source":"nps_gis"},"listed_date":"1979-12-11","is_nhl":false,"nhl_designated_date":null,"areas_of_significance":["Commerce","Engineering","Transportation","Exploration/Settlement"],"significance_levels":["state"],"summary":{"what_it_is":"A canal lock and the remains of an aqueduct on the Ohio and Erie Canal at the Cuyahoga River, about 600 feet north of State Route 303 in Peninsula, Summit County, Ohio, built 1825-1827.","why_significant":"The lock and aqueduct abutments are surviving parts of the Ohio and Erie Canal, which the reviewers described as important in the region's development. They lie within Peninsula, which preserves a largely intact mid-nineteenth century canal and mercantile town.","narrative":"Lock No. 29, known as the Peninsula Lock, and the remains of its aqueduct are part of the Ohio and Erie Canal at Peninsula, Summit County, Ohio. Built between 1825 and 1827, both are made of cut stone. The lock is a standard mitered-gate type with a chamber measuring 90 by 15 feet. At Peninsula the Cuyahoga River bends so sharply that it returns within fifty feet of itself, and the canal crossed the river here on an aqueduct. A source cited in the form describes it as a wooden trough with a plank towpath carried on stone arches. The aqueduct originally had two spans. Its center pier was later removed when a single-span steel structure replaced it, and that structure was destroyed in the great flood of 1913. The stone abutments remain, and the lock sits at the northern approach. The site lies within a village that retains much of its mid-nineteenth century canal and mercantile character.","period_of_significance":"1825-1827","architect_builder":null,"architectural_style":null,"criteria":[],"status_note":"Listed condition is good; the lock and aqueduct abutments survive, while the later steel aqueduct was destroyed in the 1913 flood.","vacant_flag":null,"machine_generated":true,"model":"claude-sonnet-5-5","prompt_version":"v1.0-2026-10-29","generated_at":"2026-10-29 02:53:12.508449-05","source_pdf":"https://s3.amazonaws.com/NARAprodstorage/lz/electronic-records/rg-079/NPS_OH/79000305.pdf"},"photo":null,"district":{"nrhp_refnum":"74000346","name":"Peninsula Village Historic District","url":"https://nationalhistoricalregister.com/districts/ohio/peninsula-village-historic-district-74000346/"},"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":"https://catalog.archives.gov/id/71986306","wikipedia":null,"wikidata":null},"indexable":true,"url":"https://nationalhistoricalregister.com/ohio/summit-county/lock-no-29-and-aqueduct-79000305/"}