Bay bridge bypass: construction site
This is the boat pier on the East side of the bay bridge construction site. Here a service connected the two Caltrans command centres at Yerba Buena island, and it's from here I got the awesome ferry ride out on the water to have a look at the entire span of the bridge.
On the left hand side of the image you can see the new section of the bridge completely rolled into place; when I arrived on Saturday evening it was being worked on by engineering crews who were working on a pile of verification and connection tasks.
The bypass weighs about 7000 tons (!) and was assembled 50m up in the air and slid into place on rails. I asked about what it takes to overcome that sort of inertia to get it moving, and the answer was lots of hydraulics and dish soap.
In the mid-ground on the right two-thirds of the image, you can see the existing Bay bridge; just behind it is the new bridge. For the majority of the distance, the deck is in a side-by side configuration. I believe that the current point where it is up to is named W2; from there until pier E2 (mostly obscured by the construction work) it becomes a deck suspended by a pylon, and after that it converts into a double deck configuration to enter into Yerba Buena island.