Hoping to catch a glimpse of SR 99 tunnel construction? Summer is an ideal time to visit Milepost 31, our project information center, located at 211 First Ave. S. in Seattle’s Pioneer Square neighborhood. Our free public tours give visitors a great view of the work site from a section of the Alaskan Way Viaduct that has been permanently closed to traffic.
Tours depart from Milepost 31 Tuesday through Saturday. Advance registration is required. Each tour is a half-mile round trip, and visitors must be able to walk over uneven ground and climb up and down 50 stairs.
After the tour, stick around to look at the exhibits about the people and projects that shaped Pioneer Square. Learn how natural forces and people transformed Seattle’s landscape over time, and get an inside look at the SR 99 Tunnel Project.
No speaker series in July
Normally we host a monthly speaker series in conjunction with Pioneer Square’s First Thursday Art Walk, but due to the holiday we won’t be hosting the event in July. Milepost 31 will remain open until 8 p.m. on July 2 for the Art Walk. The center will be closed on July 3 and 4. Speaker Series will resume on Aug. 6.