Bob Kerrey Pedestrian Bridge in Omaha/Council Bluffs. Image: Nic221 on flickr.
The bridges over the Potomac, Anacostia, and Rock Creek are very important connections over the strongest boundaries in DC. The relatively few crossings are the bane of commuters and a significant impediment to the development and livability of the DC area. So, it’s no surprise that David Garber has been advocating for a pedestrian bridge across the Anacostia. The most recent iterations have been drawing on the NCPC‘s Extending the Legacy Plan (PDF) and subsequent plans. Plus, there have been a slew of impressive and iconic pedestrian bridges popping up in the US. I think that connecting across the river would be great, but maybe something more than just a fixed link would be best for the Anacostia.
For me, the whiz-bang factor of a bridge is offset by the need for this kind of structure to work as an urban space. Creating a more pleasant route for non-motorized commuters is a good enough end, but for more casual enjoyment, it needs some other qualities. Iconic bridges tend to beautifully express directed motion from one end to another, but not the pauses and distractions of a stroll.
In a way, you create a long pedestrian-only space with no activating buildings. Without a mass of people, those spaces are alienating or unsafe.
There are some relevant examples that approach the concept differently: