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Pioneer Square SR-99 tunnel project exhibit combines history, technology

Replica of SR 99 tunnel boring machine on display now at in Pioneer Square in Seattle

The world’s largest-diameter tunnel boring machine will arrive in Seattle next year, but you don’t have to wait until then to check it out. A 10-foot-long, motorized replica of the machine is on display now at Milepost 31, an award-winning information center that highlights the people and projects that shaped Pioneer Square and provides an inside look at the SR 99 Tunnel Project.

About 35 times smaller than the real thing, the model offers an up-close look at the inner workings of the five-story machine that will dig the SR 99 tunnel. The push-button display allows visitors to control some of the model’s parts, demonstrating how the real machine will work as it bores up to 200 feet beneath downtown Seattle.

Check out the model and other cool exhibits at Milepost 31, located at 211 First Ave S., between 11 a.m. and 5 p.m. Tuesdays through Saturdays. Admission is free.

For more information about Milepost 31, visit www.milepost31.org.

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