Site is 30 miles southwest of Portland off Oregon 47. Go west on Highway 8 (Tualatin Valley Highway) through Hillsboro until you see the Forest Grove junction with Highway 47. Go left (south) on Highway 47 to Hagg Lake/Scoggins Valley Park signs (5.9 miles). Turn right at the signs and drive straight to the Park entrance (3.7 miles)
From Portland, OR: Travel east on I-84 to Exit 18. At the end of the off-ramp, turn left (south) onto the Historic Columbia River Highway and follow the highway through the town of Corbett. Two miles east of Corbett, the road forks. Take the righ fork onto Larch Mountain Road and follow it for 14 miles to reach Larch Mountain Picnic Area and Trailhead.