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Today I learned http://oregonstate.edu/ua/ncs/archives/2015/feb/study-outlines-impact-tsunami-columbia-river talks about tsunami effect on the Columbia, stating that tides will have more effect than the river flow. What it can't predict is any changes in the Columbia itself caused by the earthquake. Most of my geological studies have been from disaster movies, so I'm no expert but if the path of the river changed the realities would be very different than the projections. Quote from the linked article:The maps show it will not get to Portland ? The mega wave 50 feet will reach Portland easily.
Based on a maximum 9.0 magnitude earthquake and associated tsunami, at the highest tide of the year, the research concluded:
Just offshore, the tsunami would raise water levels about 11.5 to 13 feet.
Just inside the mouth of the Columbia River, the water would rise about 13 feet.
At river mile 6, approaching Hammond, Ore., the river would rise about 10 feet.
At river mile 25, near Welch Island, the river would rise about 1.6 feet.
At river mile 50, near Longview, Wash., there would be no measurable rise in the river.