After a two-year hiatus, the Seattle to Portland bicycle event in on for this year. July 16, the riders will be passing through Summit and Spanaway. Spanaway Middle School is a lunch stop and very busy between 10 am and 2pm on Saturday. The Cascade Bicycle Club is the organizer and the route map can be found here.
More information on the ride can be found on the Portland Bicycling Club site.
Affected local roads are 72nd Street, Canyon Road 104th Street, Waller Road, Military Road and Perimeter Road.