{"nrhp_refnum":"74001558","name":"Ludwig, Isaac R., Historical Mill","other_names":["Heising Mill"],"category":"district","location":{"address":"Mill Rd. in Providence Park","address_restricted":false,"city":"Providence","county":"Lucas County","state":"OH","lat":41.415408125000056,"lon":-83.86253520499997,"geom_source":"nps_gis"},"listed_date":"1974-06-28","is_nhl":false,"nhl_designated_date":null,"areas_of_significance":["Industry","Commerce"],"significance_levels":["local"],"summary":{"what_it_is":"A historic grist mill district in Providence Park, Providence, Lucas County, Ohio, made up of a wooden mill, its millrace, Lock #9 and a section of the Miami and Erie Canal. The mill was completed in 1849 and largely rebuilt about 1895.","why_significant":"The mill, the remaining canal and Lock #9 are presented as a well-preserved example of early industry and commerce in Ohio. The canal powered the mill and the mill added to the canal's economic life, creating an interdependent complex. The mill also held water rights granted in 1842 that obligate the state to maintain its water supply.","narrative":"Beside the Maumee River in Providence Park, a wooden mill and a stretch of the Miami and Erie Canal form a small historic district. The mill measures 60 by 36 feet and rests on a cut stone foundation. Peter Manor, founder of Providence, contracted for it shortly before his death in 1847. Isaac R. Ludwig bought the unfinished building and completed it in 1849, then ran it for 40 years. Most of the present structure dates from a rebuilding about 1895, and a fire around 1930 destroyed the upper story and roof. Three late 19th-century turbines remain, and canal water still supplies the mill under rights granted in 1842. The district also includes the millrace and dry Lock #9, whose stonework is in good condition. It was listed as a well-preserved example of early Ohio industry and commerce, in which the canal powered the mill and the mill supported the canal. The park district plans a museum.","period_of_significance":"19th and 20th centuries (specific dates c. 1895 and c. 1930)","architect_builder":"Isaac R. Ludwig completed the mill in 1849; Peter Manor began it","architectural_style":null,"criteria":[],"status_note":"Condition marked fair and altered; milling ceased in early 1974 and the park district plans to restore the mill to its c. 1900 appearance for use as a museum.","vacant_flag":null,"machine_generated":true,"model":"claude-sonnet-5-5","prompt_version":"v1.0-2026-10-29","generated_at":"2026-10-29 02:53:09.970203-05","source_pdf":"https://s3.amazonaws.com/NARAprodstorage/lz/electronic-records/rg-079/NPS_OH/74001558.pdf"},"photo":null,"district":null,"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":"https://catalog.archives.gov/id/71990033","wikipedia":null,"wikidata":null},"indexable":true,"url":"https://nationalhistoricalregister.com/ohio/lucas-county/ludwig-isaac-r-historical-mill-74001558/"}