06/18/2026
On June 17, 1974, a group of 620 bicyclists, ranging in age from 12 to 57, departed from Lake Sammamish State Park for a five-day trek across Washington via Interstate 90. Heading to Expo '74 in Spokane, the riders aimed to promote the state's new "Zero Litter" program and highlight the need for highway litter control; each participant carried a litter bag.
The event was sponsored by the Washington Department of Ecology and KJR Radio Channel 95, in association with the Washington State Highway Commission/WSDOT, the Washington State Patrol, and the Washington National Guard.
A report issued after the trip recommended that bicycling groups no longer be permitted on the interstate freeway system. Furthermore, it advised that the age, physical condition, and cycling experience of all participants should be thoroughly vetted before embarking on any future cross-state trips.
And maybe bike helmets.
đź“· Cross-state bike expedition, June 1974. WSDOT photographs, Washington State Archives.