{"nrhp_refnum":"79000699","name":"Railroad Overpass at Ocmulgee","other_names":[],"category":"structure","location":{"address":"Off GA 49","address_restricted":false,"city":"Macon","county":"Bibb County","state":"GA","lat":32.841092941000056,"lon":-83.59973065099996,"geom_source":"nps_gis"},"listed_date":"1979-12-18","is_nhl":false,"nhl_designated_date":null,"areas_of_significance":["Engineering","Transportation","Architecture"],"significance_levels":["state"],"summary":{"what_it_is":"A small arched brick railroad overpass within Ocmulgee National Monument in Macon, Bibb County, Georgia, built between 1870 and 1873 by an unknown builder.","why_significant":"The nomination argues the overpass is significant in architecture, engineering and transportation history. Its horseshoe-shaped arch and sweeping curved retaining walls are more ornamental than a railroad required, and it is built entirely of brick when most railroad bridges of the decade used stone, wood or iron. It also marks the 1870s relocation of the Central of Georgia line across the Dunlap plantation.","narrative":"Built between 1870 and 1873, this small brick railroad overpass sits in a wooded part of Ocmulgee National Monument in Macon, at the edge of the Walnut Creek floodplain. A horseshoe-shaped arched passage runs through the center, flanked by retaining walls that sweep outward in broad curves. Radiating brick voussoirs, a stepped watertable and a corbelled cornice complete the design. The structure was laid out for Samuel S. Dunlap, whose plantation the Central of Georgia Railroad crossed when it moved its line. It gave access to the southern part of his land and served private needs. The nomination values it for its unusually refined design, which seems better suited to a landscaped park than a working railroad, and for its all-brick construction at a time when stone, wood or iron was typical. More than a century later it still carries trains and has a road running beneath it.","period_of_significance":"1870-1873","architect_builder":"Unknown","architectural_style":null,"criteria":[],"status_note":"Described as unaltered and in good condition; still in regular use by the railroad, with a narrow paved road passing beneath it.","vacant_flag":false,"machine_generated":true,"model":"claude-sonnet-5-5","prompt_version":"v1.0-2026-10-29","generated_at":"2026-10-29 02:55:41.09755-05","source_pdf":"https://s3.amazonaws.com/NARAprodstorage/lz/electronic-records/rg-079/NPS_GA/79000699.pdf"},"photo":null,"district":{"nrhp_refnum":"66000099","name":"Ocmulgee National Monument","url":"https://nationalhistoricalregister.com/districts/georgia/ocmulgee-national-monument-66000099/"},"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":"https://catalog.archives.gov/id/93207081","wikipedia":null,"wikidata":"https://www.wikidata.org/wiki/Q134132402"},"indexable":true,"url":"https://nationalhistoricalregister.com/georgia/bibb-county/railroad-overpass-at-ocmulgee-79000699/"}