The Oregon Cascades are filled with volcanoes. One of those volcanoes dammed the McKenzie River over 2,000 years ago and drowned a pine forest that can still be seen today.
covered the landscape over the past few thousand years. Most are unlikely to erupt again, but a new volcanic field is more than likely to form in this area in the future.Sand Mountain in Oregon. Credit: Lee Siebert, Smithsonian Institution.. There are 23 cinder cones and many more lava flows that can from this line of volcanic vents. Most of these formed in eruptions that occurred only ~2,950 years ago, although the volcanic field was likely active from 4,000 to 2,000 years ago.
Eruptions like the Sand Mountain Volcanic Field start off as fissures that form, followed by lava flows that pour out of these cracks. Eventually, the lava centralized to erupt from a single location, forming a cinder cone. This closely resembles whatIn any case, one of the Sand Mountain lava flows made its way down to the ancestral McKenzie River valley. The lava flows quickly dammed the river and formed a lake — now called Clear Lake — that is up to 100 feet deep.
In some ways, this shows how something as destructive as a volcanic eruption can be a net positive to the landscape … and to the people living off that land. We can continue to enjoy the results of those lava flows from millennia ago even when keeping in mind the volcanic potential of the Cascade Range.
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