This was the 30th annual Portland Bridge Pedal, but my first one. The event closes bridges to traffic for a once-a-year cycling route over Portland's bridges, some of which are never open to bicycles outside of this event. The 20-mile route crossed these... Morrison Bridge Sellwood Bridge - first by any mode for me Hawthorne Bridge [twice] Ross Island Bridge (US26) - first by bicycle for me Marquam Bridge (I-5) - first by bicycle for me Fremont Bridge (I-405) - first by bicycle for me Steel Bridge, upper deck As part of the ride, I bicycled the entire length of Oregon's Interstate 405, which actually isn't saying as much as it sounds. It's a 4-mile spur of I-5 through downtown Portland from the Marquam Bridge to the Fremont Bridge. (3-digit Interstate freeways are spurs of or subsidiary to the route indicated in the lower 2 digits.)