Undetected shoaling was a factor when a barge carrying 1 million gallons of gasoline ran aground in the Columbia River, federal officials said.rnThe U.S. Coast Guard said the inbound towing vessel The Chiefwas pushing four barges near the mouth of Oregon's Hood River when the starboard aft barge New Dawn grounded at 0315 on July 9. About 500,000 gallons of cargo had to be lightered before the barge was dislodged from the mud two days later.
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