Knotweed elimination is an important factor in preserving habitat for fish species. It is also important for elk and deer and other species that forage on the floodplain, where knotweed is out-competing native vegetation.

The Bogachiel River joins with the Sol Duc, forming the Quillayute, about 4 miles from the town of La Push where the Quillayute empties into the Pacific Ocean. The Bogachiel is 46 miles in length, with a drainage basin of 154 square miles.

In 2006 the Quileutes surveyed the Bogachiel, recording 1,336 sites. Knotweed infestation on the Bogachiel was so extensive it was not attempted immediately and attention was focused on the Dickey.

In 2008 the Quileutes began comprehensive treatment of knotweed on the Bogachiel, treating several times from River Mile 16.5 (believed to be the upstream source of knotweed) down to the Bogachiel Fish Hatchery at RM 9. The Quileutes successfully applied to US Fish and Wildlife Service for funding to enable two more years of treatment.

In 2009 the CCNWCB provided grant match by assisting the Quileutes with treatments on the Bogachiel. The combined crew spent 8 or 9 days working together and the Quileutes spent well over a month working alone, covering only about two and a half miles, the infestations being so dense. Over 77 gallons of herbicide were used.

In 2010 the Quileutes treated the remaining stretch of the Bogachiel, from where they left off in 2009, down to the confluence with the Sol Duc. The entire Bogachiel River has now been treated once and the Quileute Nation has received positive feedback from landowners near the lower end of the river, who are impressed with the progress being made.