In addition to this weekend’s Alaskan Way Viaduct/Highway 99 closure – planned for 11 pm tonight till 5 am Monday, between the Battery Street Tunnel and West Seattle Bridge – more closures have been announced for next week, on 99 *and* the Spokane Street Viaduct:
*Next Monday night (April 9-10): Eastbound Spokane Street Viaduct closed 10 pm-5 am. (That’s the WS Bridge between 99 and I-5.) Some surface changes too – explained here.
*Next Tuesday AND Wednesday nights: Eastbound Spokane Street Viaduct closed 10 pm-5 am, ALSO southbound SR 99 between the Battery St. Tunnel and the West Seattle Bridge will close the same hours.
*The big move of ALL Spokane Street Viaduct traffic onto the new (north side) structure might happen as soon as next Thursday. All four lanes of traffic – two each way – will be on what will eventually be the westbound-only side, while the old structure on the south side gets fixed up for the final rejoining when everything’s done “in late summer” (new estimate).

During this time, the 1st Avenue South eastbound offramp will remain open, but the 4th Avenue South offramp will be closed. Details here, including some added changes on the surface streets.
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