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January 21, 2010

Deepening the Columbia, blast by blast

  • The final phase of a $188 million river channel improvement project requires some tricky underwater drilling and blasting.
    Journal Staff Reporter

    Photos courtesy of J.E. McAmis [enlarge]
    What looks like one big blast is actually several small blasts going off in sequence.

    SIRENS on a blast platform floating on the Columbia River near St. Helens, Ore., begin screeching. It's a signal that crews are about to set off another round of explosives nearly 60 feet below the surface of the river.

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