WSDOT’s 520 Replacement design team is back at it again, after taking 2013 off for lack of funding. They recently updated the design options for the future Portage Bay Bridge in a presentation to the Seattle Design Commission. The options were narrowed down to two bridge types at the end of the 2012 Community Design Process: cable stay or box girder. The goal with the fresh design update is to have a better-vetted design option ready to impress lawmakers in Olympia deciding on 520 funding during the next legislative session (expect a public open house announcement soon). Check out the updated design drawings and take a quick poll below.
Here’s another look. Cable stay:
And yet another view, from the multi-use path. Cable stay:
There you have it. The Seattle Design Commission debated the merits of each bridge type at its July 17th meeting and didn’t seem to reach an obvious consensus during discussion. The cable stay option is by far the more expensive of the two, has nine towers and has a thinner road deck. The box girder option costs less, has a thicker deck and is aesthetically more minimal. Made up your mind? Time for some democracy.
Thoughts? Put ’em in the comments or take no prisoners on the Montlake Forum. More updated drawings and info for the Portage Bay Bridge replacement can be found here and at Montlake.net’s Everything 520 page.