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Landslides in the Columbia Gorge

August 3 @ 6:00 pm - 8:00 pm

$5.00 – $15.00

Landslides in the Columbia Gorge – Aug 3rd with Dr. Tom Pierson

Could one the size that created the Bridge of the Gods happen again?
Join Dr. Tom Pierson, USGS Senior Research Scientist, for a deep dive into why there are REALLY BIG LANDSLIDES in the Columbia Gorge.

Explore the past, current and possible future state of landslides in the Columbia Gorge with Dr. Tom Pierson,  a senior United States Geological Survey scientist,  Friday, August 3 at Columbia Gorge Discovery Center & Museum, 5000 Discovery Drive, The Dalles, Oregon.  An optional $15.00 dinner begins at 6 p.m., followed by the 7 p.m. presentation. Cost for the presentation only is $5.00. Dinner menu is our Mexicali Taco Bar with dessert. Beer and wine will be available.

Have you noticed that the Oregon side of the Columbia Gorge has much steeper slopes than the Washington side?  Yet the Washington side has more landslides and bigger landslides.  This talk will explore why that is the case.  The key is the bedrock—beds of weak, weathered volcanic deposits, 25 million years old, that dip toward the river on the Washington side.  Old landslides can move again and creeping landslides can speed up, either during particularly wet winters or during earthquakes.

Dr. Tom Pierson is a fellow of the Geological Society of America, and a member of the American Geophysical Union, the Association of Environmental & Engineering Geologists, and the International Association of Volcanology and Chemistry of the Earth’s Interior.  His bibliography includes over 80 scientific publications. He is especially interested in interpreting geological hazards information from sedimentary deposits and in educating emergency management officials and the public about natural hazards.

Please sign up by Aug 1, end of day if you plan on having dinner. Walks ins for the program only 7pm ($5.00) are encouraged.



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August 3
6:00 pm - 8:00 pm
$5.00 – $15.00
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Columbia Gorge Discovery Center & Museum
5000 Discovery Drive
The Dalles, Oregon 97058
+ Google Map
541.296.8600 #201