The North Fork Middle Fork Willamette River as it is officially named but frequently called North Fork of the Willamette River or North Fork of the Middle Fork of the Willamette River has its headwaters at Waldo Lake and flows into the Middle Fork Willamette River northwest of Oakridge.
The North Fork of the Willamette River, commonly referred to as the North Fork of the Middle Fork of the Willamette River, begins at Waldo Lake and joins the Middle Fork Willamette River northwest of Oakridge.