Eastern Ontario was one of the first regions of Upper Canada to industrialize, and it did so on a scale that is difficult to appreciate today. Every town with a reliable water source had at least one mill, and many had several. By the mid-nineteenth century, the region supported foundries, tanneries, textile mills, agricultural implement factories, and dozens of other manufacturing operations. The ruins and remnants of this industrial era are everywhere, if you know what to look for.
What makes Eastern Ontario's industrial heritage particularly interesting is its visibility. Many of the region's factories and mills were built of local limestone or brick, materials that have proven remarkably durable. Buildings that have been abandoned for a century or more are often still standing, their walls intact even where roofs have collapsed and floors have fallen through.
The Mill Towns
Water power defined Eastern Ontario's industrial geography. Every rapids, every waterfall, every significant drop in elevation attracted mills. The Rideau system, with its chain of lakes and controlled water levels, supported an especially dense network of mill operations.
At Smiths Falls, the Rideau River drops through a series of rapids that once powered multiple mills simultaneously. The town's industrial heritage includes textile mills, a foundry, and the enormous Frost and Wood agricultural implement factory. The Frost and Wood complex, which at its peak employed hundreds of workers and exported equipment worldwide, is one of the most significant industrial heritage sites in the region.
Perth, further up the Tay River, was home to distilleries, woollen mills, and small manufacturers. Merrickville, on the Rideau Canal, had its own collection of mills and factories. Almonte, on the Mississippi River, was known as the Manchester of Canada for its concentration of textile mills. Each of these towns retains substantial physical evidence of its industrial past.
Eastern Ontario's industrial buildings were built to last, and many remain standing decades after their last day of operation.
The Lumber Mills
The Ottawa Valley lumber industry extended into the northern parts of Eastern Ontario, and its mill ruins are among the most impressive in the region. The transition zone between the limestone plain and the Canadian Shield, roughly along the line from Arnprior to Calabogie to Sharbot Lake, has an especially high concentration of former sawmill sites.
These mills processed the timber that was driven down the Madawaska, Mississippi, and Bonnechere rivers every spring. Their foundations, built of massive cut stone or poured concrete, are often the most substantial ruins in the area. At some sites, the remains of the dam, the headrace, and the tailrace are still visible, allowing you to reconstruct how the entire water power system worked.
Decline and Legacy
Eastern Ontario's industrial decline was not a single event but a long, gradual process. The lumber industry peaked in the 1880s and declined steadily as the forest was exhausted. Water-powered mills became obsolete as electricity became available. Small manufacturers could not compete with larger operations in the cities. The railways that had once brought prosperity to small towns began to bypass them as routes were rationalized.
By the mid-twentieth century, many of Eastern Ontario's industrial buildings were empty. Some were demolished for their materials. Others were simply abandoned, too expensive to maintain but too substantial to fall down quickly. Today, they exist in various states of preservation, from carefully restored heritage buildings to roofless shells with trees growing through their floors.
The towns along the Rideau corridor have been the most successful at repurposing their industrial heritage. Old mill buildings have become restaurants, galleries, and shops. Heritage designation has protected some of the most significant structures. But many others, particularly those in smaller communities or in remote locations, continue to deteriorate.