(SDOT “live” camera looking north along 99)
The new northbound section of Highway 99 through SODO is open (the closure ended early, last night) and the 1st Avenue offramp from the eastbound Spokane Street Viaduct opens Wednesday. Those are highlights of this week’s day-by-day/night-by-night traffic-alerts list (compiled from lists provided by SDOT and by WSDOT):

SUNDAY 9/16 (tonight)
99/Alaskan Way Viaduct: Closed southbound between Battery Street Tunnel and West Seattle Bridge, 9 pm-5 am.
Spokane Street Viaduct: Nothing planned

MONDAY 9/17
99/Alaskan Way Viaduct: Closed southbound between Battery Street Tunnel and West Seattle Bridge, 9 pm-5 am.
Spokane Street Viaduct: Tonight, SDOT says, “Surface S Spokane Street west of East Marginal Way will be restricted overnight from 10 p.m. on Monday until 2 a.m. on Tuesday morning. During this time, northbound traffic on East Marginal Way wishing to turn west onto S Spokane Street will be detoured to the north and directed to make a u-turn. Southbound traffic on East Marginal Way will be permitted to turn west onto S Spokane Street.”

TUESDAY 9/18
99/Alaskan Way Viaduct: Closed southbound between Battery Street Tunnel and West Seattle Bridge, 9 pm-5 am.
Spokane Street Viaduct: Tonight, SDOT says, “First Avenue S, from the on/off-ramp to the north side of the intersection of First Avenue S and S Spokane Street will be closed from 10 p.m. on Tuesday until 5 a.m. on Wednesday morning. The on/off-ramp connecting the westbound lanes of the Spokane Street Viaduct with First Avenue S will remain open during the closure.”
West Seattle road work alert: Beach Drive between Atlas and Juneau is scheduled for resurfacing, with the work planned 8 am-7 pm.

WEDNESDAY 9/19
99/Alaskan Way Viaduct: Closed southbound between Battery Street Tunnel and West Seattle Bridge, 9 pm-5 am.
Spokane Street Viaduct: From SDOT, “The eastbound off-ramp at First Avenue S will reopen Wednesday morning … The same morning, First Avenue S between S Spokane and S Horton Streets will be returned to two travel lanes in each direction, and the eastbound stretch of surface S Spokane Street from East Marginal Way to First Avenue S will reopen.”
West Seattle road work alert: Beach Drive between Atlas and Juneau is scheduled for resurfacing, with the work planned 8 am-7 pm.

THURSDAY 9/20
99/Alaskan Way Viaduct: Closed southbound between Battery Street Tunnel and West Seattle Bridge, 9 pm-5 am.
Spokane Street Viaduct: Nothing planned.

FRIDAY 9/21-SATURDAY 9/22-SUNDAY 9/23
99/Alaskan Way Viaduct:
Spokane Street Viaduct:

The latest version of this list is always linked atop the WSB sidebar and atop the WSB Traffic page.