The Washington State Department of Transportation—getting it, as usual, exactly backwards—plans to build a temporary elevated structure to accommodate traffic along the waterfront while a bored tunnel is being dug to replace the viaduct. Once the tunnel's finished, the state will take down the temporary viaduct, and only then will it turn its attention to the downtown street grid and the waterfront.
The new structure, which will be on the south end of the current viaduct, will connect waterfront traffic to a new section of the viaduct WSDOT plans to build in SoDo. Somewhat astonishingly, this new quasi-viaduct will actually have more lanes than the existing stacked viaduct (six instead of four), all on a single level. According to the Daily Journal of Commerce (sorry, subscription only) the structure will be part of a $300 million contract to replace the south end of the viaduct.
For years now, surface/transit supporters have been advocating the opposite approach (no matter what the city and state ultimately decide to do about the viaduct). Fix the waterfront first, they've argued, then tear down the viaduct, and only then think about replacing it. As we saw during the 2001 earthquake, people are adaptable; they have the ability to change in response to changing circumstances. (When traffic gets bad on Road X, some people take Road Y, ride public transit, rearrange their schedules, etc.—and traffic gets better). Tear down the viaduct, reconnect the street grid downtown and in South Lake Union, and people will figure out new ways to get through and around downtown—something we'll have to do anyway if the city and state can't come up with enough money to pay for the tunnel. Build a new, wider temporary viaduct, and people will never learn to adapt. By putting off waterfront improvements until the very end of planning, WSDOT is setting downtown surface streets up for failure—and ensuring that Seattle will continue to be car-dependent and cut off from its waterfront for decades to come.
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