Drive north from Portland on Interstate 5 to Woodland, WA. Leave the freeway at Exit 21 and turn right on to Lewis River Rd, signed as Highway 503. Set your odometer to 0 at the freeway exit. Drive east on Highway 503 for 23 miles to the former location of Jack's Restaurant. Continue straight on Highway 503 Spur through the town of Cougar. The road changes to Forest Road 90 at the Skamania County Line. Continue east on 90 to a junction with FR 25, about 47 miles from the freeway. You'll turn right here, staying on FR 90. Cross the North Fork of the Lewis River, pass the Eagle Creek Store and continue up FR 90 into the forest. The Lower Lewis River Falls Trailhead is about 14 miles from Road 25 (or 61 miles from I-5), in the Lower Falls Recreation Area. Turn right off Road 90 and right again into the day use area. Park near the restrooms and take any of the use paths down to the Lewis River Trail.