The Duck River is a tributary of the Ohio River, approximately 30 mi (48 km) long, in southeastern Ohio in the United States.
It is formed in the hill country northern Washington County, approximately 15 mi (24 km) north of Marietta by the confluence of the East Fork Duck River and West Fork Duck River. The East Fork, approximately 20 mi (32 km) long, rises in the Wayne National Forest in western Monroe County and flows southeast. The West Fork, approximately 30 mi (48 km) long, rises out of the Wolf Run Lake reservoir in norhtern Noble County and flows SSE. The combined river flows south in a highly meandering course and joins the Ohio 3 mi (5 km) east of Marietta, between the mouths of the nearby Muskingum River (to the west) and Little Muskingum River (to the east).
Duck and Otter Creeks are two small streams within the larger Maumee Area of Concern, both impacted by both point source and non-point source pollution.
DuckCreek lies to the west of Otter Creek and is the last creek to enter into the mouth of the Maumee River, which empties into Maumee Bay.
The Duck and Otter Creeks Partnership is dedicated to the mission of better understanding the nature of the water, sediments, flood plains and adjacent wetlands of Duck and Otter Creeks for the purpose of promoting the protection of human health and biological integrity through voluntary non-regulatory actions.