{"nrhp_refnum":"90000482","name":"O'Shaughnessy Dam and Bridge","other_names":[],"category":"structure","location":{"address":"Co. Rd. 126 between OH 257 and 745","address_restricted":false,"city":"Shawnee Hills","county":"Delaware County","state":"OH","lat":40.15379783600008,"lon":-83.13707676299998,"geom_source":"nps_gis"},"listed_date":"1990-07-05","is_nhl":false,"nhl_designated_date":null,"areas_of_significance":["Community Planning and Development","Architecture"],"significance_levels":["local"],"summary":{"what_it_is":"A concrete gravity overflow dam, 1,750 feet long including approaches, carrying a twelve-arch reinforced concrete road bridge across the Scioto River at Shawnee Hills, Delaware County, Ohio. It was built 1922-1925 for the City of Columbus water works.","why_significant":"The nomination argues significance under Criteria A and C. It was the centerpiece of Columbus's second five-year water works improvement program in the 1920s and is a Neo-Classical design with Second Renaissance Revival influence by architect Frank L. Packard. It is the only documented bridge by Packard and the only historic combined bridge and dam of its kind on the Scioto River in the Columbus area.","narrative":"Spanning the Scioto River at Shawnee Hills, this dam and bridge were built between 1922 and 1925 to expand the water supply of Columbus. The masonry dam is 879 feet long, with earth approaches bringing the total to 1,750 feet. A twelve-span reinforced concrete arch bridge carries a brick-paved roadway and limestone-balustraded sidewalks over the spillway. An outlet gate-house, a power gate-house and an observation pavilion, all with red tile roofs and dressed limestone, give the structure a symmetrical, Neo-Classical appearance. The bridge replaced a steel truss crossing at Powell Road that the new reservoir would have flooded. Architect Frank L. Packard designed it, and Thompson-Starrett Company built it. It was named for Jerry O'Shaughnessy, long-serving superintendent of the city water works. The structure was listed for its role in the city's water works improvements and for its architecture, and it is the only historic bridge and dam combination of its kind on the Scioto River in the Columbus area.","period_of_significance":"1922-1925","architect_builder":"Frank L. Packard, Architect; Thompson-Starrett Company, Builder","architectural_style":"Neo-Classical; Second Renaissance Revival","criteria":["A","C"],"status_note":"The form states the structure retains integrity and its architectural features remain intact. Current functions are listed as waterworks and road- and pedestrian-related transportation.","vacant_flag":false,"machine_generated":true,"model":"claude-sonnet-5-5","prompt_version":"v1.0-2026-10-29","generated_at":"2026-10-29 02:53:14.909901-05","source_pdf":"https://s3.amazonaws.com/NARAprodstorage/lz/electronic-records/rg-079/NPS_OH/90000482.pdf"},"photo":{"url_800":"https://nationalhistoricalregister.com/media/90000482/2f8d30874e-800.webp","url_1600":"https://nationalhistoricalregister.com/media/90000482/2f8d30874e-1600.webp","licence":"CC BY 2.5","author":"Analogue Kid at en.wikipedia","credit_html":"<a href=\"https://commons.wikimedia.org/wiki/File:OS_Dam_Ohio.JPG\" rel=\"noopener\">Analogue Kid at en.wikipedia</a>, <a href=\"https://creativecommons.org/licenses/by/2.5\" rel=\"license noopener\">CC BY 2.5</a>, via Wikimedia Commons","source_page":"https://commons.wikimedia.org/wiki/File:OS_Dam_Ohio.JPG"},"district":null,"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":"https://catalog.archives.gov/id/71988084","wikipedia":"https://en.wikipedia.org/wiki/O%27Shaughnessy_Dam_(Ohio)","wikidata":"https://www.wikidata.org/wiki/Q7071957"},"indexable":true,"url":"https://nationalhistoricalregister.com/ohio/delaware-county/oshaughnessy-dam-and-bridge-90000482/"}