Hole in the Wall Falls, Warren Creek.
Hole in the Wall Falls, This Waterfall was Man Made as a Diversion for Warren Creek Falls, Warren Creek Falls Used to Spray on to the Historic Columbia River Hwy Causing the Road to be Iced over in the Winter Months. From What I Understand The Water from the Tunnel was Carried Over the Top of the Historic Hwy via a Wooden Flume. The Flume has Long Since Decayed.
ColumbiaGorgeOregonRiverHole in the Wall Falls