Providence Bridge Pedal

From the organizer's website. Registration required.

Join your friends and neighbors on Sunday, Aug. 9 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