I previously told you about some upcoming Seattle tunneling projects. Here now is a link to artist renderings of the new SR 520 floating bridge project, which will raise the existing bridge up above the pontoons, making space for maintenance works and storm water treatment and fire suppression utilities underneath: www.flickr.com/photos/wsdot/6871707294/in/set-72157629307832804/
The photo site has links to more descriptive material about the project. The East approach to the SR 520 bridge, including a new overpass/lid, is under way. The cost of this work will be partly paid through tolls on the bridge.
Used with permission from WSDOT.