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Kiltie Lane S Woody Mtn Rd Arb/MPRS As you enter Flagstaff from the south, Rte 17N will turn into Milton Ave. About one mile from the first stoplight on Milton, at the intersection with a Chevron and the Barnes and Noble, turn left on W route 66. Go west on Rte 66 for a little over a mile. Then turn left on Woody Mountain Rd. Go straight on Woody Mountain Rd for 4 mi. (dirt surface for 3 mi) to the Arboretum entrance on your right (large Arboretum sign and gate). Once you enter the Arboretum gate, follow the signs for the Merriam-Powell Research Station (MPRS) along a winding driveway.