The river emerges from the mountains near Riddle .
The river bends sharply south around a ridge , joining the South Umpqua about 2 miles ( 3 km ) west of Canyonville .
The river emerges from the mountains near Riddle , and bends sharply south around a ridge , joining the South Umpqua about 2 miles ( 3 km ) west of Canyonville .