It went right by here!
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https://www.academia.edu › 73784627 › Missoula_floods_Subglacial_Artesian_Basin_and_its_ Full_Physical_pattern_3d_Edition_Jul_2021
Some temporary lakes rose to an elevation of more than 400 ft (120 m), flooding the Willamette Valley to Eugene, Oregon and beyond. Iceberg rafted glacial erratics and erosion features are evidence of these events. Lake-bottom sediments deposited by the floods have contributed to the agricultural richness of the Willamette and Columbia Valleys ...
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stateparks.oregon.gov/index.cfm?do=park.profile&parkId=96
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This 90-ton rock was deposited during an Ice Age flood. It floated over 500 miles in an iceberg 12,000 to 17,000 years ago, by way of the Columbia River. When the ice melted, the rock was left behind. This is the largest glacial erratic found in the Willamette Valley. It is a type of rock not normally found in Oregon because it came from the Northern Rocky Mountains. Visitors at Erratic Rock can look out across the vast landscape and imagine the huge amount of water that filled the Willamette Valley during the Ice Age Floods.
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As the previous link said "geologic setting of the scabland region consisted of a thick, tilted saucer of basalt, in places warped into ridges and completely overlain by a "frosting" of loess."
Just another brick in the thick tilted basalt saucer.