- Associated Press - Thursday, February 19, 2015

CORVALLIS, Ore. (AP) - A study has found that an earthquake-caused tsunami could raise the water level as much as 13 feet just inside the mouth of the Columbia River and almost 7 feet within a few miles of Astoria.

Oregon State University engineers also found that the water level increases would be very slight around Portland or Bonneville Dam.

The evaluation is based on a 9.0-magnitude earthquake and tsunami, at the highest tide of the year.

Researchers are paying increased attention to risks along rivers because of the damage from the 2011 tsunami in Japan.

The research has led to the development of new flooding maps, which can aid landowners and land-use planners.

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