This is the Tamolitch Falls called the Blue Pool on the McKenzie River, near Sisters Oregon. The falls are dry because the water filters into the porous lava rock under the pre-historic path of the river. In wetter times of the year, not all the water flows underground and cascades over the edge of the pool. At this time of year, all the water comes up from underground to fill the pool and feed the river. This is not a small trickle the river downstream has plenty of water in it.
After spending 13 to 26 years underground, being filtered by lava rock it bubbles up in this location at 37-38 degrees — too cold for micro-organisms and not exposed to sunlight, so no algae growth. Or this may be the source of Windex.
Here is a link to the google map for the area.
Link to our route Portland to Boise
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