Olentangy River

About

Olentangy River, Ohio — 1790s-1810s Wyandot Frontier, 1840s-1880s Milling, 1973 State Scenic 97-mi Columbus Delaware. The river's earliest human record is in its names. To the Delaware it was the "stone for your knife stream," for the shale along its banks. To the Wyandot, whose territory this was before contact, the name derives from an Algonquian word meaning "river of face paint" or "river of red paint," a reference to pigment deposits along the shore. The Wyandot village of Leatherlips stood near present-day Dublin. The 1790s through 1810s marked the Wyandot frontier period along the river; the 1840s through 1880s brought a milling era to its banks.

The surrounding watershed was worked hard through the nineteenth century. From the 1830s through the 1920s the Olentangy basin was logged to feed the regional timber industry and the railroad expansion of the 1860s onward. Local sawmills, logging drives, and downstream lumber operations were the major operators until the old-growth stands were exhausted around 1910 and state forestry conservation took hold. Hydrologists arrived close behind the loggers: the first comprehensive studies of the river came with USGS survey work in the 1870s and the gauging stations established in the decades that followed.

The twentieth century reshaped the channel itself. In the early 1900s engineers significantly rerouted the Olentangy to curb flooding and clear ground for Ohio Stadium. In 1935 the 5th Avenue dam was built to supply cooling water for a power plant on The Ohio State University campus—a structure that turned a stretch of river into a sluggish impoundment. That trade-off, flow for utility, defined the river through much of the century.

The 1973 State Scenic River designation began to reverse the logic. Recognition as only Ohio's third scenic river anchored a long restoration campaign that culminated in 2012, when the 5th Avenue Dam in Columbus was removed—the centerpiece of a series of dam removals that transformed the Olentangy from an impoundment back into a free-flowing urban river. Fish passage, water quality, and paddling conditions all improved. It was a rare thing: a city choosing to unbuild a river rather than build on it.

Today the Olentangy runs in three distinct characters. The upper 20 miles from Delaware to Powell are rural, a sequence of riffles and pools. The middle 15 miles from Powell to Worthington move through a suburban corridor and include the dam-removal reaches where the restoration is most visible. The final 12 miles from Worthington to the Scioto confluence are pure urban Columbus, threaded by the greenway section. Along the way the river supports the Delaware, Worthington, and Columbus communities and passes public land including Highbanks Metro Park and Delaware State Park. Protected as an Ohio State Scenic River and paralleled by the Olentangy River Greenway, it remains a working case study in what a central-Ohio river can become when the dams come out.