{"nrhp_refnum":"78002165","name":"Muskingum River Lock No. 10 And Canal","other_names":[],"category":"district","location":{"address":"N bank of Muskingum River, N of RR bridge S to lock terminals","address_restricted":false,"city":"Zanesville","county":"Muskingum County","state":"OH","lat":39.944539493000036,"lon":-82.01751256899996,"geom_source":"nps_gis"},"listed_date":"1978-12-19","is_nhl":false,"nhl_designated_date":null,"areas_of_significance":["Transportation","Architecture"],"significance_levels":["state"],"summary":{"what_it_is":"A lock and lateral canal on the north bank of the Muskingum River in downtown Zanesville, Ohio, at river mile 76.6, completed in 1841 as part of the Muskingum River navigation system. The 0.8-mile canal bypasses rapids near the Y Bridge.","why_significant":"The nomination presents the lock and canal as a monument to engineering history of the second quarter of the nineteenth century. They are part of the Muskingum River system of locks, dams and lateral canals that has provided water transportation to the Ohio and Mississippi Rivers for more than 130 years. Lock No. 10 continues to carry pleasure craft.","narrative":"Lock No. 10 and its lateral canal sit on the north bank of the Muskingum River in downtown Zanesville, built to avoid rapids near the Y Bridge. The canal is about 50 feet wide and 0.8 miles long, with concrete walls. At its downstream end is a two-chamber lock of large sandstone blocks laid in regular ashlar, with wooden gates framed in iron and operated by hand. The lock and dam were completed in 1841 at a cost of $228,000, built by Josiah Spaulding under civil engineer David Bates. They belong to a series of locks, dams and canals opened between Marietta and Dresden under a state act of 1836. Commercial traffic declined after the railroad arrived in 1857, and the federal government took over the system in 1886. Steamer service ended in 1922, and commerce faded after 1943. The towpath is now a state-owned park, and the lock still serves hundreds of pleasure boats each year.","period_of_significance":"1800-1899","architect_builder":"Josiah Spaulding (builder of the lock); David Bates, civil engineer, supervised the work at Zanesville","architectural_style":null,"criteria":[],"status_note":"Canal and lock remain in active use for pleasure craft; a 1961 report noted the need for repairs to parts of the structure. The wooden canal control gate appears to be no longer in use.","vacant_flag":false,"machine_generated":true,"model":"claude-sonnet-5-5","prompt_version":"v1.0-2026-10-29","generated_at":"2026-10-29 02:53:12.160819-05","source_pdf":"https://s3.amazonaws.com/NARAprodstorage/lz/electronic-records/rg-079/NPS_OH/78002165.pdf"},"photo":null,"district":{"nrhp_refnum":"07000025","name":"Muskingum River Navigation Historic District","url":"https://nationalhistoricalregister.com/districts/ohio/muskingum-river-navigation-historic-district-07000025/"},"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":"https://catalog.archives.gov/id/71990777","wikipedia":null,"wikidata":null},"indexable":true,"url":"https://nationalhistoricalregister.com/ohio/muskingum-county/muskingum-river-lock-no-10-and-canal-78002165/"}