Take highway 666 out of grovedale, it turns into the weyhauser (200 series haul road) stay on the main haul road until around km 2-163. the staging area is right there. follow the groomed trail in past dead horse meadows, not too far after dead horse there is tee intersection on the trail... If you want to go to the falls keeping going straight. (don't turn right) the trail will take you right to the river.
Don't try and approach the falls from the river, that's some Bad Eats!!!