This is the route of the Seattle To Portland Bicycle Classic, 2010. The ride can be done in one day but most people take two. This bike map shows the route of the second day.
The second day is broken into two parts, Centralia to Longview and Longview to Portland. The first part is mostly rolling hills through rural Washington. Upon reaching Longview the route crosses the Columbia River via the Louis and Clark Bridge. Riders are guided across the bridge by volunteers on motorcycles. A lot is said about how dangerous the bridge is during the ride. In reality it’s not that bad, the shoulders are wide and at no time does the route cross the flow of traffic.
Once over the bridge the route follows hwy 30 to Portland. The route is scenic but traffic is high and shoulders can be narrow. I don’t like this portion of the ride very much. When the route reaches Portland it goes through an industrial area then through the trendy Pearl District before crossing the steel bridge and ending at Holiday Park next to the Loyd Center mall.
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