Take I5 South to Salem Parkway
Make your way to Highway 22 West (Beaches)
Take Highway 22 west from Salem 10 miles to 99W
Turn left (South) on 99W and go 18.8 miles, through Monmouth, continue on 99W to Arboretum Road
Turn right, go 0.8 miles and follow the signs, turning right into Peavy Arboretum
Go North on 3rd Street which turns into 99W
Go 6 miles north on 99W, turn left on Arboretum Road
Go 0.8 miles and follow the signs turning left into Peavy Arboretum
A map showing the location of Peavy Arboretum is here and driving directions to the arboretum are here.
Coordinates of the Forestry Cabin at Peavy Arboretum: 44°39'37"N,123°14'18"W