Seattle is a city defined by water. We are squeezed between Puget Sound and Lake Washington, and work around two other lakes, Lake Union and Green Lake. We have lots of bridges.
This is the Ship Canal Bridge, an immense structure built to move massive amounts of freeway traffic over the canal which connects Lake Union to Lake Washington. It’s a double decker, with the main north and south lanes on top, and reversible express lanes on the lower level.