Miami and Erie Canal Lock 8
Saint Marys Township, Auglaize County, Ohio
Marker Inscription
OHIO DEPT. NATURAL RESOURCES DIVISION OF WATER MIAMI AND ERIE CANAL Lock 8 <- 1.4 miles to Mile Marker 128 .5 mile Lock 7 ->
The Story
This marker stands along the route of the Miami and Erie Canal, the great 274-mile waterway that once linked Cincinnati on the Ohio River to Toledo on Lake Erie. Begun in the 1820s and completed in the 1840s, the canal climbed Ohio's interior through a chain of numbered locks like this one, each a stone-and-timber chamber that raised and lowered boats step by step across the landscape. Lock 8 sat in the summit region near St. Marys, where feeder reservoirs kept the channel full at its highest elevation. The signs here, placed by the Ohio Department of Natural Resources, guide visitors along the towpath from one surviving lock and mile marker to the next.
Why it matters
Before railroads, canals like the Miami and Erie knit the young interior of America to national markets, turning frontier Ohio into a shipping powerhouse and shaping where its towns grew. The chain of locks preserved here is a tangible trace of the canal era that briefly made water the highway of the nation.
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Miami and Erie Canal – Footprint of Lock 12
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In the 1830s Ohio was racing to knit its interior farms to the wider world by water, and the Miami and Erie Canal was the state's grand answer—a hand-dug ribbon eventually linking Cincinnati on the Ohio River to Toledo on Lake Erie. The stretch reaching Troy was carved beginning around 1834, and by 1836 Lock 12 was raising and lowering canal boats through the town, its stone chamber letting vessels step up or down the valley's grade. The Troy section opened with real fanfare on July 4, 1837, when General William Henry Harrison—already a national figure and a future president—joined other dignitaries to mark the occasion. Today only the lock's footprint remains, a quiet trace of the waterway that once carried the region's grain, pork, and passengers.
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In the 1830s, canal fever swept Ohio as the young state raced to link its farms to the wider world. The Miami and Erie Canal, whose Lock 15 section here was dug between 1833 and 1837, was part of an ambitious waterway that eventually stretched some 250 miles from Cincinnati on the Ohio River to Toledo on Lake Erie. Locks like this one raised and lowered mule-drawn boats step by step across the region's changing elevation, and the towns that grew up along the towpath — Tipp City among them — owed their early prosperity to the barges gliding past.