Watershed Map

The Illinois River originates in the headwaters near Hogeye, Arkansas 15 miles southwest of Fayetteville. The river flows westerly crossing the Ozarks into Oklahoma five miles south of Siloam Springs, Arkansas, near Watts, Oklahoma. The river continues southwesterly in Oklahoma to Lake Tenkiller. Below the Tenkiller Ferry Dam, the Illinois River flows into the Arkansas River near Gore, Oklahoma.

Watershed Map