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Here is a photo of an I-5 interchange ramp after WSDOT retrofitted the columns. The improved columns will help keep the bridge ramp safe during an earthquake. Crews excavate 30 feet deep into the ground to pour a concrete base for the columns. After the concrete base is poured, crews begin to install steel jackets along the entire length of the column. Here is a photo of a column with half of its steel jacket installed.Crews finish installing a steel jacket to strengthen a support column on the Corson Avenue/Michigan Street on-ramp bridge. Here is a series of completed and partially completed columns supporting the ramps from I-5 south to the West Seattle Freeway and Columbia Way. Tully's is to the right of the photo (out of view). Here are a series of catcher blocks supporting the I-5/Corson Avenue off-ramp in Georgetown. Catcher blocks help stabilize the bridge from moving side-to-side during an earthquake.
A close-up view of a catcher block. A completed, retrofitted column supporting the SR 900/Aberdeen Street/112th Avenue SE undercrossing in Renton.