{"nrhp_refnum":"89002020","name":"Mayo's Bar Lock and Dam","other_names":["9f1sas2","9f1sas3","9f1sas4","9f1sas5","9f1sas6"],"category":"district","location":{"address":"On the Coosa River, 8 mi. SW of Rome","address_restricted":false,"city":"Rome","county":"Floyd County","state":"GA","lat":34.19991645700006,"lon":-85.2557211373362,"geom_source":"nps_gis"},"listed_date":"1989-11-16","is_nhl":false,"nhl_designated_date":null,"areas_of_significance":["Engineering","Transportation","Architecture"],"significance_levels":["state"],"summary":{"what_it_is":"A historic district on the Coosa River about eight miles southwest of Rome, Floyd County, Georgia, centered on a river lock and stone-filled crib dam built by the U.S. Army Corps of Engineers in 1911-1915, now part of a county park.","why_significant":"It is the only intact survivor of six Coosa River locks and dams built between 1872 and 1917 and the oldest lock in Georgia. It represents early 20th-century navigation engineering and the river trade that supported Rome and the Coosa Valley. The district also holds three prehistoric (Early-Middle Archaic and Late Mississippian) and two historic archaeological sites with potential to yield information.","narrative":"Mayo's Bar Lock and Dam is a river navigation structure on the Coosa River, roughly eight miles southwest of Rome, Georgia. The U.S. Army Corps of Engineers built it between 1911 and 1913, with work continuing to 1915. It was the northernmost point of a planned slack-water route toward the Gulf of Mexico. The poured-concrete lock measures 40 by 210 feet with a nine-foot lift, and the dam is a log-and-crosstie crib filled with locally quarried stone. It is the only intact survivor of six similar Coosa locks and dams and the oldest lock in Georgia. Steamboats used it from 1913 to 1941, first carrying farm products and later mostly passengers, though it came too late to save commercial river traffic. The surrounding county park also holds three prehistoric sites from the Early-Middle Archaic and Late Mississippian periods, plus a wharf site and an abandoned limestone quarry from construction. Together they make up the historic district.","period_of_significance":"8000-800 B.C.; 900-1540 A.D.; 1911-1915 A.D.","architect_builder":"US Army Corp of Engineers; Pennsylvania Bridge Company, Beaver Falls, Pennsylvania (contractor)","architectural_style":"no style","criteria":["A","C","D"],"status_note":"The lock has been inoperable since 1941. The property is now a county park and campground, and a section of the dam near the lock wall has washed away. Rehabilitation for recreational boating is being considered.","vacant_flag":false,"machine_generated":true,"model":"claude-sonnet-5-5","prompt_version":"v1.0-2026-10-29","generated_at":"2026-10-29 02:55:42.982541-05","source_pdf":"https://s3.amazonaws.com/NARAprodstorage/lz/electronic-records/rg-079/NPS_GA/89002020.pdf"},"photo":null,"district":null,"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":"https://catalog.archives.gov/id/93207998","wikipedia":null,"wikidata":"https://www.wikidata.org/wiki/Q34886220"},"indexable":true,"url":"https://nationalhistoricalregister.com/georgia/floyd-county/mayos-bar-lock-and-dam-89002020/"}