Five Mile Furnace/Union Furnace
Starr Township, Hocking County, Ohio
Marker Inscription
Location: One-half mile south of crossroads of Union Furnace, Starr Township, on State Route 328. Dates: 1853 - Fuel: Charcoal Condition: Bluff and level area remains on east side of highway.
The Story
Along State Route 328 in Hocking County stand the remains of an iron furnace blown in around 1853, part of the charcoal-iron industry that spread across southeastern Ohio's Hanging Rock region. Furnaces like this one devoured local timber and ore to cast pig iron for the young nation's rails, stoves, and machinery. Today only the bluff and a level furnace yard survive on the east side of the highway.
Why it matters
These backwoods furnaces were the seedbed of American heavy industry, transforming Appalachian Ohio's forests and ore beds into the iron that built the industrial age.
The story behind this marker
AI contextThe era
In the middle of the nineteenth century, the wooded hills of southeastern Ohio were anything but quiet backcountry. This corner of Hocking County sat inside what became known as the Hanging Rock Iron Region, a broad belt of ironmaking that stretched across southern Ohio and into northern Kentucky. The land here happened to hold the three things a charcoal furnace needed all in one place: bands of iron ore, outcrops of limestone for flux, and, above all, seemingly endless hardwood forest to burn.
When this furnace was blown in around 1853, the young United States was hungry for iron. Railroads were pushing west, cities were filling with iron stoves and machinery, and farms wanted plows and kettles. A rural furnace like this one turned a patch of Appalachian Ohio into a small industrial engine, converting local timber and rock into pig iron that traveled out to foundries and rolling mills.
These were charcoal furnaces, and that single fact shaped everything around them. Crews of woodcutters and colliers worked the surrounding hills, felling trees and slowly charring the wood into charcoal. A furnace could consume an astonishing amount of forest in a season, so ironmaking and the woods rose and fell together.
People & events
A charcoal furnace was really a small, self-contained village at work. The stone stack itself was only the heart of it. Around it labored fillers who charged the furnace from the top with alternating loads of charcoal, ore, and limestone; keepers who watched the fire day and night; and teamsters who hauled raw material in and pig iron out along rough country roads.
Out in the hills, woodcutters and charcoal-makers kept the whole operation fed. The work was hot, constant, and dangerous, and a furnace in blast ran around the clock for months at a stretch, because letting the fire die meant a long and costly relighting. Whole families often depended on a single furnace for wages, housing, and the store where they spent them.
The marker fixes this furnace to State Route 328, roughly half a mile south of the Union Furnace crossroads, and notes that it was fueled by charcoal beginning in the early 1850s. What survives today is described plainly: a bluff and a level area on the east side of the highway — the quiet footprint of an industry that once roared here.
Its place in the American story
It is easy to picture America's industrial rise as a story of big cities and towering steel mills. But places like this furnace are where much of that story actually began. Before coke and coal came to dominate, the nation's iron came largely from hundreds of rural charcoal furnaces tucked into wooded, ore-rich regions like this one.
The iron they produced became the ordinary hardware of a growing country: rails and wheels, stoves and tools, machine castings and cookware. Regions like the Hanging Rock district helped prove that the United States could supply its own heavy industry rather than depend on imported metal, a matter of both economic strength and national pride in the decades before the Civil War.
These furnaces also carried a cost that echoes forward to us. Their appetite for wood reshaped whole landscapes, and when richer ore fields and new fuels emerged elsewhere, the charcoal-iron economy faded. The overgrown ruins scattered across Appalachian Ohio mark both the birth of American heavy industry and the impermanence of the boom it created.
If you visit
Come here expecting subtlety rather than spectacle. This is not a towering ruin but a reading of the land: a bluff and a level furnace yard on the east side of State Route 328, just south of the Union Furnace crossroads. Slow down, and the terrain itself becomes the exhibit.
Stand at the level area and imagine the noise and heat that once filled it — the glow at the top of the stack, the rumble of charcoal and ore going in, the surrounding hills stripped and smoky. The very quiet and greenery you see today is part of the story, because the forest eventually reclaimed the ground that ironmaking once consumed.
It makes a rewarding stop on a back-roads drive through Hocking County's hill country, especially paired with the region's better-known natural areas. Treat the site with care, keep to what you can see from public ground, and let it be a reminder that some of the most important places in American history are the ones you could easily drive right past.
Written by AI to add context, grounded in the marker’s inscription and the historical record. The inscription above is the original, unaltered text.
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