The Middlebury River is a tributary river of Otter Creek in Addison County, Vermont.[1][2] Three branches feed the river from origins in Green Mountain National Forest.[2] The river is 18.6 miles (29.9 km) long, has a watershed of 62.8 square miles (163 km2), and is located southeast of Lake Champlain.[3] The river passes through Ripton, Middlebury and Salisbury.[3]