Latest Past Events

Sheila Alfsen – Mt. St. Helens May 18,1980 Eruption – Lwr. Columbia Chapter

Tualatin Heritage Center 8700 SW Sweek Drive, Tualatin

The 1980 Eruption of Mt. St. Helens in Washington was the worst volcanic disaster in recorded US history. Geologist Sheila Alfsen, will bring the event back to life; detailing its onset and eruption sequence. She will illustrate its volcanic hazards with examples from other volcanoes and comparing their relative sizes. Sheila will discuss the advances in volcanology made as result of the eruption, and how they are used around the world to gain prediction and offer disaster mitigation. Thursday, May 15, 2025, In Person 7:00 PM (PDT) at Tualatin Heritage Center, 8700 SW Sweek Drive, Tualatin, OR 97062 ALSO Live ZOOM from THC, Click for Zoom meeting, Meeting ID: 869 4651 3479 Passcode: 322382. Sheila Alfsen Sheila Alfsen's Background: *Current Instructor of Geology: Portland State University, Chemeketa Community College, Linn Benton Community College *Researcher *FEMA Earthquake Publication Reviewer *Paleontology- University of Oregon, Volcanology, Oceanography *Master of Arts in Teaching, Western Oregon University *Bachelors of Arts from Western Oregon University, Geology and Spanish *Oregon resident since 1970 - extensively traveled in US, particularly the Western states, Alaska, Arctic region, Iceland, Hawaii, Mexico, Puerto Rico * Thirty-five years in Education: Experience in interpretation for National Park Service

Free

2025 IAFI Membership Meeting – Gorge-ous Gathering May2-3-4

Columbia Gorge Discovery Center 5000 Discovery Dr., The Dalles

 Celebrating Ice Age Floods Institute's 30th Anniversary The annual IAFI Membership Meeting is coming to the Columbia Gorge this May 2-3, 2025, and all our members and their guests are cordially invited to come experience some of the best and most interesting features the Gorge has to offer. There’ll be opportunities to explore storied Gorge wildflowers and native plants, geology and winery field trips, whitewater rafting, a membership meeting/dinner and a presentation by the ever-entertaining Nick Zenter. Friday, May 2nd, will be action packed with activities during the day. Choose between a guided Spring Wildflower Walk, a Journey Through Terroir field trip, an Unveiling the Gorge field trip (repeated on Sunday, May 4). There are also opportunities available every day for full-day or half-day adventure whitewater raft trips on the Klickitat or White Salmon Rivers with Wet Planet Rafting, a local world-class rafting company. Friday evening will feature our members meeting and dinner, followed by an entertaining and informative presentation by the inimitable Nick Zenter exploring and geolocating J Harlan Bretz’s field notes.  Jim O'Connor Richard Waitt Saturday, May 3rd, will feature the main Ice Age Floods Gorge Geology Field Trip – Explore evidence of the Ice Age Floods in the Columbia Gorge led by USGS expert geologists Jim O’Connor and Richard Waitt. This  field trip will examine the geology of the Columbia River Gorge with emphasis on the effects of the Ice Age Missoula floods, examining key sites and discussing the latest research. Learn more about the Missoula Floods, explore dramatic flood landforms, and enjoy beautiful vistas, lunch at the Deschutes River Park (order a box lunch or bring your own), and a no-host afternoon recap at Maryhill Winery. Check-in begins each day at 8:00 AM at the Columbia Gorge Discovery Center Find more detailed information here There is also plenty to see and do in the Gorge to keep you fascinated and engaged if you can stay another day. Visit iconic Multnomah Falls (I-84 access only) and spectacular Vista House at Crown Point overlook. Visit Timberline Lodge, a stunning 1930’s CCC project, on the snowy upper flanks of Mt. Hood. Travel the Hood River Fruit Loop or ride the Mt Hood Railroad Hike one (or more) of the innumerable and spectacular Gorge hiking trails Take Windsurfing and Kiteboarding lessons or just watch the action Enjoy fine dining, artisan wineries, breweries, museums and shops throughout the Gorge. There’s so much more to see and do that we can’t even begin to list it all.

Oregon Gold – This valuable mineral is brought to you by Geology

Tualatin Heritage Center 8700 SW Sweek Drive, Tualatin

Geologist and professor, Sheila Alfsen, will show how geologic processes that occurred in Oregon paved the way for the discovery and utilization of gold in our state. Sheila is an Adjunct Instructor of Geology at Portland State University, Chemeketa Community College, and Linn-Benton Community College. Tuesday, February 18, 2025, In Person 6:45PM PST at Tualatin Heritage Center, 8700 SW Sweek Drive, Tualatin, OR 97062 Simultaneous Live ZOOM from THC if you cannot attend the in-person THC meeting yourself. Click here for Zoom meeting, Meeting ID: 869 4651 3479 Passcode: 322382