A $13 million slope-stabilization project is under way in Oregon. It's expected to put an end to an "ancient" slow-motion landslide that has damaged the Sellwood Bridge for decades. "They are basically nailing the entire hillside into the slope, while using those same mechanisms to buttress the new bridge," said Scott Burns, a Portland State University geology professor. Forty shafts, each about six feet in diameter, have been bored into the ground from 56 feet to 88 feet deep and filled with 610 tons of reinforcing steel and almost 3,415 cubic yards of concrete.

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