Appalachian Community Histories – Boone Furnace, Carter County: Iron, Civil War, and Life Along Grassy Creek
Along Grassy Creek in northern Carter County, the surviving stone stack of Boone Furnace stands as a reminder of a period when northeastern Kentucky was one of the important iron-producing districts of the Ohio Valley. Long before the region became associated primarily with coal, railroads, timber, and later manufacturing, furnaces were scattered through the wooded hills of Carter, Greenup, and Boyd counties, drawing on local ore, limestone, timber, and labor to make pig iron.
Boone Furnace belonged to the Kentucky side of what nineteenth-century geologists and industrial writers called the Hanging Rock Iron Region. The district stretched across the Ohio River, linking furnaces in northeastern Kentucky with those in southern Ohio. By the time Boone Furnace appeared in the 1850s, ironmasters had already spent decades learning how to turn the region’s forests and mineral deposits into an industry that created furnace villages, wagon roads, stores, farms, and trading networks throughout the hills.
Yet Boone Furnace was more than another industrial site. During its relatively short working life it became a postal community, a center of local Unionist activity during the Civil War, the scene of a Confederate raid, and later the focus of an ambitious attempt to revive industry through coal, iron, and railroad development. Its history can be reconstructed unusually well because letters, newspapers, federal postal records, industrial directories, geological reports, company currency, and federal engineering documentation have all survived.
Even the year of its construction presents a historical puzzle. The Kentucky Historical Society marker states that Sebastian Eifort and his associates built the furnace in 1856, while the American Iron and Steel Association’s 1876 directory gave 1855 as its construction year. Later accounts of Eifort’s life generally place his move from Ohio into Carter County in 1856. For that reason, the safest conclusion is that Boone Furnace was established during the 1855 to 1856 period, with 1856 appearing most consistently in the surviving biographical tradition.
Sebastian Eifort and the Making of Boone Furnace
The man most closely associated with the furnace was Sebastian Eifort, an experienced iron manufacturer whose career had already taken him through several Ohio furnaces before he came to Kentucky. The Civil War Governors of Kentucky project identifies Eifort as a German immigrant who worked at Jackson, Scioto, and Bloom furnaces in Ohio and helped establish Harrison Furnace in Scioto County in the early 1850s. After disposing of his Ohio interest, he turned his attention south of the Ohio River and became one of the founders of Boone Furnace.
Later family records identify John Eifort, Thomas Price, and several other investors among the men involved in purchasing land and developing the furnace property. While the precise ownership structure changed over time, contemporary and near-contemporary sources consistently place Sebastian Eifort at the center of the operation.
The location was not accidental. Boone Furnace sat amid the mineral and timber resources that had made the Hanging Rock district attractive to ironmasters. Kentucky Geological Survey work later examined the hills around the property in detail. Geological reports identified substantial fire-clay deposits on the ridge between Grassy Creek and Three Prong Creek and at the Old Orchard diggings on Boone Furnace property. The reports show how closely nineteenth-century industrial development followed the geology of the surrounding countryside.
Iron production also demanded enormous quantities of wood. Boone was listed among Kentucky’s charcoal furnaces in Thomas Dunlap’s 1874 Wiley’s American Iron Trade Manual. Forests surrounding a furnace were therefore not simply scenery. They were part of the industrial plant. Trees were cut, stacked, and slowly burned into charcoal, which supplied the intense heat needed inside the furnace stack.
The result was an industry that extended far beyond the stone furnace itself. Woodcutters worked the surrounding hills. Teamsters hauled ore, limestone, charcoal, food, and merchandise. Furnace hands tended the blast and casting operations. Clerks kept accounts, while merchants supplied workers and their families. Farms around the furnace helped sustain a settlement that depended on constant movement between the industrial site and the countryside surrounding it.
How Boone Furnace Worked
The furnace that rose beside Grassy Creek was a substantial stone structure. The Kentucky Historical Society states that it originally stood 44 feet 7 inches high and measured about 10½ feet across at its widest internal point. Air entered through a tuyere connected to a steam-powered blast, helping the charcoal fire reach the temperatures necessary to reduce iron ore and produce molten iron.
Contemporary industrial directories offer slightly different dimensions, probably reflecting measurements taken at different times or differences in how the stack was recorded. Wiley’s American Iron Trade Manual listed Boone Furnace in 1874 as a hot-blast charcoal furnace with a 36-foot stack and an 11-foot bosh. It gave the furnace an average annual capacity of about 3,000 tons and identified the Ohio & Kentucky Coal & Iron Railroad Company as proprietor.
The American Iron and Steel Association’s 1876 directory offered still another set of figures, listing a stack approximately 43 feet high and 10 feet in diameter and estimating annual capacity at 4,500 net tons. By then, however, the directory reported that Boone was not in blast during 1875.
Those differences are useful rather than troublesome. They show that Boone Furnace was not frozen in time. Industrial directories recorded properties for commercial purposes, sometimes using different standards or information gathered from owners. Together they establish Boone as a modest but significant charcoal furnace tied firmly to the wider iron economy of northeastern Kentucky.
The furnace’s product was pig iron, cast from molten metal flowing from the stack. From there, iron could be transported to other establishments for additional processing. In an era before modern highways and motor trucks, that transportation problem mattered enormously. Furnaces needed dependable roads, access to markets, and eventually rail connections if they hoped to compete with increasingly large industrial plants elsewhere.
Boone Furnace Becomes a Community
Boone Furnace quickly became more than a work site. A post office opened there by 1860, giving the settlement an official identity that would outlast iron production itself. The federal Post-Office Directory for 1866 listed “Boone Furnace” in Carter County and named Sebastian Eifort as postmaster. The printed directory appears to have rendered his surname as “Eifont,” but the identity is clear from the surrounding historical record.
Four years later, the Post Office Department’s 1870 national directory still included Boone Furnace among Carter County’s post offices alongside Grayson, Olive Hill, Mount Savage, and other communities.
The post office reveals something important about the nature of nineteenth-century furnace settlements. Industrial communities often grew around their furnaces because workers needed housing, food, stores, mail, medical care, churches, and places to conduct business. A furnace could therefore put a name on the map where previously there had been farms and scattered households.
The Eifort family itself participated directly in this community. A later history of Marietta College recalled that Sebastian Eifort’s son William Henry Eifort worked at Boone Furnace as a clerk and storekeeper before the Civil War. The furnace store would become particularly important in 1862, when war reached the settlement with sudden violence.
The Civil War Comes to Boone Furnace
Boone Furnace’s most dramatic surviving primary source was written there on October 6, 1862.
Sebastian Eifort addressed a letter to Kentucky governor James F. Robinson just two days after Confederate soldiers attacked the settlement. The document, now preserved through the Civil War Governors of Kentucky Digital Documentary Edition, provides a rare eyewitness account written almost immediately after the event.
According to Eifort, Confederate troops struck Boone Furnace during the evening of October 4. They fired into houses and forced women and children into the woods. The raiders emptied goods from the furnace store, took horses and mules, and carried away two men. Eifort estimated the value of the stolen property at approximately $3,000, a substantial loss for a rural industrial community in 1862.
The raid was part of a much broader breakdown of security in northeastern Kentucky. Eifort reported that Confederate troops numbering roughly 1,100 to 1,200 men were around Olive Hill with artillery and were threatening Union supporters throughout the region. He complained that Confederate forces had seized control of the state road running between Catlettsburg and Owingsville, taking horses, mules, merchandise, and provisions as they moved through the countryside. Families were fleeing toward Ohio, while men feared being forced into Confederate service.
The furnace settlement soon became a military position as well as an industrial one. Eifort wrote that seven companies of the 117th Ohio Volunteer Infantry arrived at Boone Furnace around daylight on October 5, only hours after the attack.
A newspaper account published in the New York Times on October 19, reprinting material from the Louisville Journal, gives additional detail about the military situation in Carter County. After word spread that Confederate forces had taken Grayson, Union men guarded roads leading toward Boone Furnace and Olive Hill. About seventy-five men were stationed on one road leading toward the furnace and another force of roughly one hundred guarded a separate approach.
This was not a great battlefield in the conventional sense. There were no massive lines of infantry or famous generals commanding armies beside the furnace stack. Yet the events at Boone Furnace show what the Civil War looked like in much of Appalachian Kentucky. Roads, stores, horses, food, furnaces, and small communities became military resources. Civilians could be driven from their homes without warning, while armed bands and regular troops competed for control of transportation routes connecting the interior of Kentucky with the Ohio River.
For Boone Furnace, the war was fought close enough for gunfire to enter the houses.
Iron Production After the War
Boone Furnace survived the Civil War period, but the industry surrounding it was changing rapidly. Production figures preserved by the Kentucky Historical Society indicate that the furnace continued operating into the early 1870s. Its final blast came in 1871, when it reportedly produced about 1,400 tons of iron.
That did not immediately end efforts to make the property profitable.
By 1874, Wiley’s American Iron Trade Manual identified the proprietor as the Ohio & Kentucky Coal & Iron Railroad Company. The company’s very name captured the industrial ambitions surrounding the property. Iron production, coal resources, and railroad development were increasingly viewed as parts of the same economic future. A successful railway could move raw materials into industrial sites and carry finished products toward the Ohio River and national markets.
Surviving company scrip provides a particularly tangible reminder of those efforts. Notes issued at Boone Furnace in 1874 by the Ohio & Kentucky Coal, Iron & Railroad Company survive in several denominations. These pieces of company currency demonstrate that the property remained part of an active business venture even after the furnace’s final recorded blast.
The attempted revival apparently did not return Boone Furnace to sustained production. By 1876, the American Iron and Steel Association listed Nathaniel Sands in connection with the furnace but reported that the stack had not been in blast during 1875.
Boone’s difficulties reflected changes facing charcoal iron throughout the region. Older furnaces depended on nearby forests and relatively small deposits of ore. Meanwhile, larger industrial works were increasingly tied to railroads, coke, improved blast technology, and centralized production. A stone charcoal furnace hidden along a Carter County creek could still make iron, but competing with the rapidly expanding industrial system of the late nineteenth century was another matter.
The Town That Outlived the Furnace
Ironmaking stopped, but Boone Furnace did not immediately disappear.
The 1875 to 1876 Williams directory still listed Boone Furnace as a Carter County post office, evidence that the place-name had survived the closing of the industrial works.
The Kentucky State Gazetteer and Business Directory for 1881 to 1882 provides an even more revealing glimpse of the community a decade after the last blast. It described Boone Furnace as a Carter County post-office settlement about eighteen miles northeast of Grayson, with a population of approximately thirty and semi-weekly mail service. C. W. Wooten served as postmaster.
The directory named merchants, a sawmill operator, a cooper, a druggist, a flour-mill operator, and farmers in or around the settlement. The old furnace village had become something different. Instead of disappearing overnight when iron production ended, it contracted into a small rural community.
That transition is easy to overlook when industrial history is told only through production totals and furnace specifications. Boone Furnace was home as well as workplace. Children grew up around it. Families received mail there. People bought medicine and groceries there. Wagons traveled the roads long after molten iron stopped flowing from the stack.
The post office itself remained in operation until the 1880s, giving Boone Furnace several years of life as a recognized community after its iron industry had faded.
What the Geologists Found
By the late nineteenth century, scientific surveys were documenting the resources that had helped create northeastern Kentucky’s furnace industry.
Phillip N. Moore’s work for the Kentucky Geological Survey examined the iron ores and iron manufacturing of Greenup, Boyd, and Carter counties as part of the Kentucky division of the Hanging Rock Iron Region. These reports are among the most valuable sources for understanding Boone Furnace because they place an individual industrial site inside the geology and economy of an entire furnace district.
Samples from Boone Furnace property continued to appear in state and federal geological literature. Fire clay was documented on the ridge between Grassy Creek and Three Prong Creek, where one deposit was reported to be eight to ten feet thick. Other samples came from the Old Orchard diggings. Decades later, the United States Geological Survey continued citing Boone Furnace material in its study of American clays.
These dry geological descriptions reveal the physical foundation beneath the furnace story. The hills were being mapped layer by layer because generations of industrial development had made their mineral resources economically significant.
The furnaces of northeastern Kentucky were never isolated monuments dropped randomly into the woods. Their locations were dictated by geology, water, timber, transportation, capital, and labor. Boone Furnace existed because all of those factors briefly came together along Grassy Creek.
The Furnace Becomes a Historic Site
As the industrial community faded, the stone furnace stack remained.
The Historic American Engineering Record eventually documented Boone Furnace as HAER KY-40. The Library of Congress record preserves professional documentation of the furnace and identifies it as a surviving engineering resource in Carter County. Photographic work associated with the survey created a permanent federal record of a structure that had already endured more than a century of weather and abandonment.
The Commonwealth also commemorated the site with Kentucky Historical Marker No. 1013. The marker stands near the junction of Kentucky Routes 2 and 1773 and directs travelers toward the furnace site. Its brief text summarizes the construction, dimensions, steam blast, final production, and 1871 closing that represent only part of the much larger story preserved in the archives.
The ruins matter because so much of the community that surrounded them has vanished. Stores disappear. Roads shift. Houses are replaced. Company books are lost. Forests return to land once stripped for charcoal. A massive stone stack is harder to erase.
For travelers who encounter Boone Furnace today, the structure can look almost strangely permanent against the wooded Carter County landscape. In reality, its working life was short. The furnace belonged to a narrow industrial window between the expansion of the Hanging Rock iron industry and the rise of larger, better connected forms of iron production.
What endured was the stone.
Why Boone Furnace Matters
Boone Furnace tells several Appalachian stories at once.
It is a story of natural resources transformed into industry, when timber-covered hills supplied charcoal and local geology determined where men invested money and built furnaces. It is a story of migration and entrepreneurship, represented by Sebastian Eifort, a German immigrant who learned the iron business in Ohio before carrying that experience into Carter County.
It is also a Civil War story. Eifort’s October 1862 letter turns Boone Furnace from an industrial ruin into a populated settlement caught in a war that invaded homes, emptied stores, stole livestock, carried away residents, and sent families running toward Ohio. Few surviving furnace sites have a document that places their inhabitants so directly inside the fear and disorder of wartime eastern Kentucky.
Then there is the story of decline. Boone Furnace ceased making iron, but investors continued trying to find value in the property. Company scrip, industrial directories, and railroad ambitions reveal people refusing to accept immediately that the furnace era was finished. When those efforts failed, the community did not simply vanish. The post office continued, merchants remained, and a small settlement carried the Boone Furnace name into the 1880s.
Today the surviving stack connects all of those chapters.
It once stood beside a working industrial community filled with furnace hands, clerks, merchants, families, wagons, horses, soldiers, and travelers. It witnessed the growth of the Hanging Rock iron industry, the disruption of civil war, the last blast of 1871, and the slow return of the surrounding landscape to a quieter Carter County countryside.
Boone Furnace may no longer pour iron, but the records left behind make it possible to hear something of the community that once grew around its fire.
Sources & Further Reading
Eifort, Sebastian. Letter to James F. Robinson, October 6, 1862. Office of the Governor, James F. Robinson, Governor’s Official Correspondence File, Military Correspondence, Kentucky Department for Libraries and Archives. Civil War Governors of Kentucky Digital Documentary Edition. https://discovery.civilwargovernors.org/document/KYR-0001-027-0049
“Fighting in Carter County.” New York Times, October 19, 1862. Reprinted from the Louisville Journal, October 12, 1862. Transcription hosted by KYGenWeb. https://kygenweb.net/carter/military/fighting_in_carter_county.htm
United States Post Office Department. Post-Office Directory for 1866: Alphabetical List of Post-Offices in the United States, with the Names of Post-Masters. 1866. https://upload.wikimedia.org/wikipedia/commons/d/d3/Post-office_directory_for_1866.Alphabetical_list_of_post-offices_in_the_United_States%2C_with_the_names_of_post-masters.._%28IA_cu31924030137404%29.pdf
United States Post Office Department. List of Post Offices in the United States Arranged Alphabetically, Revised and Corrected to September 1, 1870. Washington, DC: Government Printing Office, 1870. https://kygenweb.net/allky/counties/post-offices-1870.html
American Iron and Steel Association. The Ironworks of the United States: A Directory of the Furnaces, Rolling Mills, Steel Works, Forges and Bloomaries in Every State. Centennial ed. Philadelphia: American Iron and Steel Association, 1876. https://upload.wikimedia.org/wikipedia/commons/5/54/The_ironworks_of_the_United_States_-directory_of_the_furnaces%2C_rolling_mills%2C_steel_works%2C_forges_and_bloomaries_in_every_state%28IA_ironworksofunite00ameriala%29.pdf
Dunlap, Thomas, ed. Wiley’s American Iron Trade Manual of the Leading Iron Industries of the United States. New York: John Wiley & Son, 1874. https://upload.wikimedia.org/wikipedia/commons/e/eb/Getty_Research_Institute_%28IA_wileysamericanir00dunl%29.pdf
Kentucky Geological Survey. Reports of Progress, Volume 1, New Series. Edited by Nathaniel S. Shaler. Frankfort, KY: Kentucky Geological Survey, 1876. https://uknowledge.uky.edu/kgs_ar/6/
Moore, Phillip N. “Report on the Iron Ores of Greenup, Boyd, and Carter Counties: The Kentucky Division of the Hanging Rock Iron Region.” In Reports of Progress, Volume 1, New Series, 59–136. Kentucky Geological Survey, 1876. https://uknowledge.uky.edu/kgs_ar/6/
Moore, Phillip N. “The Iron Manufacture of the Kentucky Division of the Hanging Rock Iron Region.” In Reports of Progress, Volume 1, New Series, 317–353. Kentucky Geological Survey, 1876. https://uknowledge.uky.edu/kgs_ar/6/
Peter, Robert, and John H. Talbutt. “Chemical Report of the Soils, Marls, Clays, Ores, Coals, Iron Furnace Products, Mineral Waters, etc. of Kentucky.” In Reports of Progress, Volume 1, New Series. Kentucky Geological Survey, 1876. https://uknowledge.uky.edu/kgs_ar/6/
Kentucky Geological Survey. A General Account of the Commonwealth of Kentucky. Frankfort, KY: Kentucky Geological Survey. https://upload.wikimedia.org/wikipedia/commons/a/ae/A_general_account_of_the_Commonwealth_of_Kentucky_%28IA_generalaccountof00kent%29.pdf
R. L. Polk & Co. Kentucky State Gazetteer and Business Directory, 1881–1882. Vol. 3. Detroit: R. L. Polk & Co., 1881. The Boone Furnace entry describes the post-office settlement, population, mail service, postmaster, merchants, physician, sawmill, cooper, and flour mill. https://ldsgenealogy.com/KY/books/Kentucky-state-gazetteer-and-business-directory-1881-1882-Vol-III-pt-1-part-8.htm
Ricker, Louisiana Moore. Diary entry, April 11, 1866. Louisiana Moore Ricker Diary. Scioto County Public Library. https://www.sciotolibrary.org/history/files/original/708350d21fe7f397b080d2cf38675f85.pdf
Ohio & Kentucky Coal, Iron & Railroad Company. Company scrip issued at Boone Furnace, Kentucky, January 1, 1874. Heritage Auctions catalog records. https://currency.ha.com/c/catalog-print.zx?saleNo=62379
United States Census Bureau. Eighth Census of the United States, 1860. Population Schedule, Carter County, Kentucky, p. 60. Referenced in the Civil War Governors of Kentucky authority record for Sebastian Eifort. https://test.discovery.civilwargovernors.org/document/S32209630
Historic American Engineering Record. “Boone Furnace, Carter County, Kentucky.” HAER KY-40. Prints and Photographs Division, Library of Congress. https://www.loc.gov/item/ky0377/
Ries, Heinrich. The Clays of the United States East of the Mississippi River. U.S. Geological Survey Professional Paper 11. Washington, DC: Government Printing Office, 1903. Boone Furnace material appears in the Kentucky section. https://pubs.usgs.gov/pp/0011/report.pdf
Kentucky Historical Society. “Boone Furnace.” Kentucky Historical Marker No. 1013. https://history.ky.gov/markers/boone-furnace
Carter County, Kentucky. “History.” Carter County Government. Includes Boone Furnace as Kentucky Historical Marker No. 1013. https://cartercounty.ky.gov/About/Pages/History.aspx
Civil War Governors of Kentucky. “Sebastian Eifort.” Civil War Governors of Kentucky Digital Documentary Edition. The authority record identifies Eifort as a Carter County furnace owner who built and owned Boone Furnace from 1856 to 1866. https://test.discovery.civilwargovernors.org/document/S32209630
Evans, Nelson W., ed. A History of Scioto County, Ohio, Together with a Pioneer Record. Portsmouth, OH: N. W. Evans, 1903. See the biography of Sebastian Eifort. https://ldsgenealogy.com/OH/books/A-history-of-Scioto-County-Ohio-together-with-a-pioneer-record-part-92.htm
Evans, Nelson W., ed. A History of Scioto County, Ohio, Together with a Pioneer Record. Portsmouth, OH: N. W. Evans, 1903. See the biography of William Henry Eifort, which records his work as clerk and storekeeper at Boone Furnace. https://ldsgenealogy.com/OH/books/A-history-of-Scioto-County-Ohio-together-with-a-pioneer-record-part-32.htm
Evans, Nelson W., ed. A History of Scioto County, Ohio, Together with a Pioneer Record. Portsmouth, OH: N. W. Evans, 1903. See the biography of John B. Gregory, which discusses his engineering, financial, and managerial work with Boone Furnace. https://ldsgenealogy.com/OH/books/A-history-of-Scioto-County-Ohio-together-with-a-pioneer-record-part-133.htm
Marietta College. Marietta College in the War of Secession, 1861–1865. Marietta, OH: Marietta College, 1878. See the biographical sketch of William Henry Eifort, pp. 74–78. https://eakycivilwar.blogspot.com/2010/?m=0
Perrin, W. H., J. H. Battle, and G. C. Kniffin. Kentucky: A History of the State. 8th ed. Louisville and Chicago: F. A. Battey & Co., 1888, 807–808. Cited by the Civil War Governors of Kentucky project for its Sebastian Eifort biography. https://test.discovery.civilwargovernors.org/document/S32209630
Collins, Lewis, and Richard H. Collins. History of Kentucky. Vol. 2. Covington, KY: Collins & Co., 1874. Contemporary regional history identifying Boone Furnace among Carter County’s iron works. https://archive.org/details/historyofkentuck02coll
Author Note: Boone Furnace is one of the places where Carter County’s industrial and Civil War histories meet in unusually well-preserved records. I hope this article helps preserve the story of the furnace community, the people who lived there, and the stone stack that still recalls northeastern Kentucky’s iron age.