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. In the first 3 miles (5 km) below Waldo Lake, the river drops 2,400 feet (730 m) in 34 separate waterfalls through diverse natural plant life and old growth forest. The river above Westfir is rated as class 3-4 (5) whitewater. Recommended flow range is 500 to 3,000 cubic feet per second (14 to 85 m3/s).