Mahoning River

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The Mahoning River is a river located in eastern Ohio and western Pennsylvania. It joins the Shenango River to form the Beaver River and is part of the Ohio River watershed.

It is formed near Winona in Columbiana County, Ohio and extends for a length of approximately 113 miles (182 km) with a watershed area of approximately 1,132 square miles (2,932 km²). It joins the Shenango River near New Castle, Pennsylvania to form the Beaver River. The river traverses five Ohio counties, Columbiana, Stark, Portage, Trumbull, and Mahoning, and as well as Lawrence County, Pennsylvania. The watershed area also includes parts of Ashtabula and Geauga Counties in Ohio.

The three main tributaries are Mosquito Creek, West Branch, and Eagle Creek, all in Ohio. There are 15 dams on the river course. The river has a course of 97.1 miles (156.3 km) in Ohio with the remainder in Pennsylvania.

The river supports over 72 species of fish and 15 species of freshwater mussels.

The river is roughly divided into two sections. The “upper elevation” extends roughly from Winona to Leavittsburg and is generally rural in nature. The mainstem (lower elevation) extends roughly from Leavittsburg to the river’s mouth near New Castle, Pennsylvania and is heavily populated and is heavily industrialized. The mainstem area has a population of over 500,000 and has a long history of steel making, coke production, and other industries.

The industrial nature of the mainstem area has caused considerable pollution in the river. Much of the pollution has left the ecosystem via the natural river flow, but it is estimated that 750,000 cubic yards (573,416 m³) of river bed and shoreline sediment over a 30 mile (48.2 km) stretch of the mainstem from Leavittsburg to the Pennsylvania border is so heavily polluted that it will need to be remediated. Approximately 45% of this material is located in the vicinity of the Girard Dam near Girard, Ohio which has acted as a trap for much of the contaminated sediment.

Petroleum hydrocarbons, benzo(a)pyrene (polynuclear aromatic hydrocarbons), and mercury have all been found in quantities several times the maximum safe levels. Since 1988, the Ohio Department of Health has maintained an advisory against swimming or wading in the river between Leavittsburg and the Pennsylvania border and advises against eating fish caught there. The Corps of Engineers estimates that the remediation will take up to 15 years to complete and cost in excess of US$100 million. If approved, the dredging project will begin in the late 2000s.

Cities and towns along its course include: