Saint Marys River

About

Saint Marys River, Ohio Indiana — 1823 Town Founding, 1840s-1880s Canal, 1990s-2010s St Marys Trail 100-mi Celina. Long before settlement, the Saint Marys flowed through the ancestral territory of the Wyandot (Huron), Shawnee, Delaware (Lenape), and Miami, with the Ottawa (Odawa) to the northwest. The river was a primary travel corridor, a hunting ground, and a gathering place, and its Indigenous route later became a canal portage. That older geography was reshaped by treaty: the 1795 Treaty of Greenville, the 1817 Treaty of the Maumee Rapids, and the 1818 Treaty of St. Mary's set the framework that led to the 1830 Indian Removal Act. The Shawnee, the Wyandotte Nation, the Delaware Tribe, the Miami Tribe of Oklahoma, and other nations maintain cultural connections to the river to this day.

The military chapter came first. In 1795, General Anthony Wayne established an important supply fort at Girty's Town on the river's west bank, using the channel to anchor American authority on a contested frontier. Permanent settlement followed a generation later. In 1823, Charles Murray, William Houston, and John McCorkle bought 400 acres from the government and laid out the village of St. Marys, lending the waterway its enduring name.

Through the nineteenth century the valley's timber fed a booming trade. The Saint Marys corridor was logged from the 1840s into the 1920s to supply Ohio's signature hardwoods — maple, oak, ash, and beech — feeding the 1850–1910 hardwood industry, canal shipping on the Miami & Erie and Ohio & Erie systems, and the Cincinnati and Cleveland lumber trade. County sawmills, logging drives, and barrel-stave and furniture industries were the major operators. The exhaustion of old-growth stands around 1910, the start of state forestry conservation in 1915, and the creation of Ohio state forests in the 1920s brought large-scale logging to an end.

Water and canals defined the same era. The river is tied to Grand Lake St. Marys and the Miami & Erie Canal, and the 1840s–1880s canal period gave the growing town its economic footing. St. Marys grew from an Indigenous travel route and canal portage into a Buckeye Trail Town, carrying a layered history of frontier fort, canal port, and timber center.

Today the Saint Marys is a mild, wadeable stream. USGS streamgage 03146500 records an average flow near 647 cubic feet per second, with an optimal paddling window between roughly 325 and 975 CFS. Rated Class I, the river runs through Auglaize, Mercer, and Van Wert counties as a designated State waterway, a tributary of the Maumee within the larger Maumee watershed. Since 2010, the Ohio EPA — working with local Watershed partnerships and Soil & Water Conservation Districts — has worked to reverse more than a century of logging, agricultural, and industrial impacts. Streambank stabilization between 2015 and 2024, native fish restocking of smallmouth bass and saugeye from 2017 to 2024, and Ohio Scenic Rivers program work between 2020 and 2024 mark the river's modern recovery. The valley that once moved timber and troops now supports the Celina, St. Marys, and Fort Wayne economies along a river slowly returning to health.