For Seattle.
Replacement of Highway 99 through Downtown, currently a rickety viaduct, a six-block tunnel that's way below code, and a short divided surface highway that's uncrossable, is to be replaced by a new 9,000 foot deep bore tunnel. This will focus exclusively on the pass-through traffic, with no exits. Design-build proposals for the main project are currently being evaluated...but both are at/below budget, which is huge news. I support the tunnel because it'll keep much of the pass-through traffic off the surface streets (Seattle is an hourglass). If things go as planned it'll break ground in 2011.
Replacement of 520 from I-5 in Seattle to Eastside, primarily a new floating bridge on Lake Washington. The bridge might collapse...as two other floating bridges have before. The new bridge would have the same 2+2 regular lanes, but also HOV lanes and
finally a bike lane. The same project would replace the section within Seattle as well, widen the Montlake Bridge to the UW, and add a couple park lids. This might start in 2012 if I recall.
I'll count as one item the incremental additions planned to our starter light rail system. One expansion is underway now on the existing line. The same line has other planned expansions north and south, and another line is planned to go east. The first portion of the next north expansion is planned for 2012 or so.
Yesler Terrace is a 28-acre low-density public housing project on First Hill, within a golf shot of the CBD proper. The Seattle Housing Authority plans to rebuild the public housing, while adding a large volume of market rate housing and commercial development (using developer money as well as housing levy funds to pay for the public portion). The options being studied range from 3,000 to 5,000 total units plus a million sf or more of commercial and medical. Here's an overview:
http://www.seattlehousing.org/redeve...erview/#vision
I'm not sure about the fourth. A lot of developers have grand plans for new/expanded districts. Large organizations (universities, hospitals, etc.) have master plans. In terms of all-new projects, one that's large and fairly urban is the Spring District, planned for a current industrial site in Bellevue, straddling the planned East Link light rail line.
http://wrightrunstad.com/properties-...-district.aspx