Oil tankers may need tug escort on Columbia

The colorful tug Island Viking pushes a barge down the ­Columbia River near Mosier in 2017. Tethered tug escorts could provide added protection for oil tankers on the Columbia River if tanker traffic increases.

ASTORIA (AP) — Tethered tug escorts could provide added protection for oil tankers on the Columbia River if tanker traffic increases due to new marine terminals, a study commissioned by the Washington Legislature found.

The study released last month by the Department of Ecology said five proposed bulk terminals could create up to 1,379 additional one-way trips, mostly by tankers, The Daily Astorian reported Thursday.