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A look inside the deteriorating drainage pipe.
WSDOT maintenance crews discovered excessive pea gravel and debris in the pipe during a routine inspection of the 30-inch drainage (stormwater) pipe on the northbound SR 167 ramp to northbound I-405.
Birdseye view of the highway intersection of SR 167 and I-405.
Crews replaced a stormwater drainage pipe that ran beneath the ramp connecting northbound SR 167 to northbound I-405.

Crew installing new drainage pipe
Crews backfill a trench after replacing part of a failing drainage pipe along the ramp from northbound SR 167 to northbound I-405.