Erie Extension Canal
Hermitage, Mercer County, Pennsylvania
Marker Inscription
Route of travel and trade, Pittsburgh to Great Lakes, 1840-1871. Important to the western Pennsylvania iron industry before the rise of the railroads. The only remaining canal lock still stands in Sharpsville.
Erected by Pennsylvania Historical and Museum Commission
The Story
For three decades before the railroads swallowed its traffic, the Erie Extension Canal carried boats, iron, and goods across western Pennsylvania between Pittsburgh and the Great Lakes. Opened around 1840, it was a lifeline for the region's early iron industry, floating raw materials and finished metal along a slender ribbon of engineered water. By 1871 the age of rails had made it obsolete, and today a single surviving lock at Sharpsville stands as its stone memorial.
Why it matters
The canal marks the brief, transformative moment when artificial waterways knit America's interior together and powered its first industrial boom, just before iron rails rendered them relics.
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Nearby & related markers
Erie Extension Canal
Sharpsville, PA
The Erie Extension Canal carried boats and cargo across northwestern Pennsylvania from 1840 to 1871, linking the Pittsburgh region toward the Great Lakes in the era before railroads reshaped American commerce. Its slack-water channels and locks floated the iron, coal, and goods that fed the growing furnaces of the Shenango and Mahoning valleys. Lock #10, a surviving guard lock at Sharpsville, is a rare physical remnant of that vanished waterway.
Erie Extension Canal
West Salem Township, PA · est. 1948
From 1840 to 1871, the Erie Extension Canal carried boats and cargo between Pittsburgh and the Great Lakes, part of the ambitious canal-building era that briefly bound the young nation together by water. Mules towed freight along its towpaths until railroads made the slow waterway obsolete. Its old bed can still be traced through Clarksville and for several miles along the road toward Mercer.
Erie Extension Canal
West Salem Township, PA · est. 1947
In the canal-building fever of the early nineteenth century, Pennsylvania cut the Erie Extension to link its interior with Lake Erie. The Shenango Line, running from New Castle toward Conneaut Lake, formally opened to Greenville in August 1840. A private company ran the waterway from 1844 until 1870, but railroads soon made it obsolete and it closed in 1871—its channel still traceable across the landscape today.
Johnston Tavern
Springfield Township, PA · est. 1948
In the decades after statehood, taverns like Arthur Johnston's were the gas stations, inns, and news exchanges of the American road. Licensed in 1827 with the present stone-and-timber building raised in 1831, this house fed and lodged travelers moving along the Pittsburgh-Mercer road in western Pennsylvania. Its fortunes were tied to the nearby Springfield Furnace, an iron works that fired up after 1837 and drew traffic to the crossroads.