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Photo: Portland-Milwaukie light rail bridge construction

By: Sam Tenney//November 9, 2011//

Photo: Portland-Milwaukie light rail bridge construction

Sam Tenney//November 9, 2011//

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Photo by Sam Tenney/91ÊÓÆµ

A drilling shaft is lowered into a cofferdam that will form the foundation of the Portland-Milwaukie light rail bridge’s west tower.  The shaft, which is around 10 feet in diameter, will be used to drill to a depth of more than 150 feet, after which drilling spoils will be removed and foundation forms will be lowered into the casing.



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