Providence Bridge Pedal

From the organizer's website. Registration required.

Join your friends and neighbors on Sunday, Aug. 10 for the one opportunity each year to bike or walk on Portland’s car-free streets and bridges, including the upper decks of both the Marquam and Fremont bridges.
There are ride options from 3 to 23 miles. If you prefer walking, check out Providence Bridge Stride, a 5 mile walk that includes crossing the upper deck of the Fremont Bridge.

https://www.providence.org/lp/bridge-pedal?utm_source=bridgepedal.com&utm_medium=redirect&utm_campaign=ProvidenceBridgePedal