Keyhole Sink near Williams, Arizona. To reach the waterfall you hike along the Keyhole Sink Trail, which can be reached at the Oak Hill Snowplay Area off Old Route 66, which can be reached at Exit 171, Pittman Valley Exit off Interstate 40 east of Williams. Go east on Old Route 66 to get tot the Oak Hill Snowplay Area, where the trail-head begins. The hike is a little over 2 miles round-trip and well worth it to see the waterfall, and petroglyphs in the area.
