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Much of SR 520 east of I-405 consists of bridges over city streets. Crews strengthened the supports of these bridges so they can withstand catastrophic earthquakes. Crew placed steel jackets on the SR 520 bridge columns at Northup Way.Crews strengthened the SR 520 bridges over the westbound SR 520 on-ramp by installing steel jackets on the columns and concrete bolsters on the crossbeams.Crews installed concrete bolsters on the crossbeams of the SR 520 bridges over 130th Avenue NE.