(Newest traffic-cam image of traffic-less Viaduct)
If all is going according to WSDOT‘s schedule, the (remaining) Alaskan Way Viaduct, and Highway 99 from there to the West Seattle Bridge, is closing about now, and is scheduled to stay closed until Monday morning. This is the twice-yearly inspection closure, and some maintenance work is being done too. (Then it’ll close again the weekend after next, Friday night 4/6 through Monday morning 4/9.)
Meantime, a commenter asks about the reason for the early April closure – as explained by WSDOT here, it’s for reinforcement work in advance of tunnel-boring.