This was a quick stop that I made just south of Crater Lake on my way into the Redwoods National Park. The Rogue River disappears into a lave tube. Lava tubes are caves which are formed when there is a giant lava flow. The outer layer of lava cools off quickly and solidifies, while the inner lava remains molten hot and slowly drains out leaving a hollow tube behind. There are many of these types of caves in the Pacific Northwest due to the underlying volcanic activity and associated fault lines. Plate tectonics are crazy! I took a geology class in college... they called it "Rocks for Jocks" cuz most of the UF athletes got A's in it. But the professor sure loved him some plate tectonics. Check wikipedia for more details...
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