The ship was greeted in Elliott Bay by a fire boat spraying water.
The $80 million machine called Bertha was built at a factory in Osaka. Its 41 pieces will be reassembled in a pit to begin the year-long dig to create a two-mile tunnel under downtown Seattle.
The new section of Highway 99 replacing the Alaskan Way Viaduct will have a diameter of nearly 58 feet.
More Northwest Headlines
Man attacked by bear at Joint Base Lewis-McChord More than 350 people evacuated as Lake Chelan wildfire grows Tourists flock to gawk at highway projects such as Seattle’s floating bridge Kitsap sewage spill prompts warning to stay out of water Medical examiner: Man who died in custody inhaled vomit Miss Tri-Cities loses crown after theft conviction revealed A look at the extreme West Coast weather With protest over, Shell prepares for Arctic Ocean drilling
Our new comment system is not supported in IE 7. Please upgrade your browser here.