Erie Extension Canal
West Salem Township, Mercer County, Pennsylvania
Marker Inscription
Route of travel and trade, Pittsburgh to Great Lakes, 1840-1871. The old canal bed may be seen here in Clarksville and for about four miles eastward along the road to Mercer.
Erected by Pennsylvania Historical and Museum Commission
The Story
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.
Why it matters
The canal recalls the short but transformative age when man-made waterways opened the interior to commerce, just before the railroad remade American transportation.
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Themes & tags
Nearby & related markers
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.
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
Hermitage, PA · est. 1946
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.
Erie Extension Canal
West Fallowfield Township, PA · est. 1948
To keep the Erie Extension Canal supplied with water, builders diked off part of the great Pymatuning Swamp with a three-mile bank, creating a 600-acre reservoir along the canal's western edge. The state began the work in 1838 and the Erie Canal Company finished it in 1843–44, an early exercise in the large-scale water management that canal engineering demanded. The reservoir was one link in a system that moved goods across northwestern Pennsylvania for nearly three decades.