Bicycle Traffic Jams

I ride almost exclusively on the west side of Portland, out to Beaverton and the western countryside.  On one occasion, I took the family into town for an appointment on the east side on Burnside, just over the Bridge.  As I sat in the car waiting for them to come out, I was astonished at the stream riders heading up Burnside.  It the evening commute, the weather wasn't particularly nice, so these weren't mere fair weather riders.  It was a bicycle super highway of relatively fit, happy people going home from work.  Well, thanks to Nathan Farney and Gabe Graff, here are some photographs of a legitimate bike traffic jam caused by a bridge raising due to a passing ship.