The Dix River is a 79.3-mile-long (127.6 km) tributary of the Kentucky River in central Kentucky in the United States.It begins in western Rockcastle County, about 5 miles (8 km) west of Mount Vernon. It flows generally northwest, in a tight meandering course, passing north of Stanford and east of Danville. Southeast of Danville it is impounded by the Dix Dam to form the Herrington Lake reservoir.