Press release:
The westbound lanes of the Spokane Street Viaduct between I-5 and SR 99 will be closed again tonight (March 16) from 10 p.m. until 5 a.m. on Saturday morning.  This will close direct access to West Seattle via the Spokane Street Viaduct from both northbound and southbound I-5.  (Motorists traveling southbound on SR 99 will still be able to access the off-ramp to the West Seattle Bridge.)
 
Southbound traffic from I-5 wishing to travel to West Seattle should detour by exiting I-5 at S Forest Street, and then follow the detoured sign route of heading west on S Forest, right on Sixth Avenue S, left onto S Lander St, left again onto First Avenue S, right at S Hanford Street, left at East Marginal Way S, and then right at S Spokane Street onto the lower Spokane Swing Bridge and into West Seattle.  Northbound traffic from I-5 wishing to travel to West Seattle should exit the freeway at Sixth Avenue S, and then from Sixth Avenue S follow the detour outlined above.
 
On Saturday morning, the old westbound exit to Harbor Island will be closed and the new off-ramp will open.  Signage will direct motorists wishing to take this exit, but it should be noted that the new off-ramp begins east of SR 99, whereas the old-ramp began west of SR 99.
 
Other closures for the coming week are listed below:
 
Monday, March 19 – Wednesday, March 21
 
·         Westbound access to the Lower Spokane Swing Bridge will be closed overnight, due to a closure of westbound lower S Spokane Street at E Marginal Way S, from 10 p.m. until 5 a.m. the following morning.  Traffic to West Seattle will be detoured via the First Avenue S Bridge.  (This closure is necessary for the demolition of the old westbound Harbor Island off-ramp, which has been replaced.)
 
·         First Avenue S at the intersection with S Spokane Street will be closed overnight, from 9 p.m. until 5 a.m. the following morning.  Northbound traffic will be detoured east on lower (surface) S Spokane Street to Fourth Avenue S, at which point motorists can turn to head north.  Southbound traffic will be detoured west at S Hanford Street.
 
Monday, March 19 – Thursday, March 22
 
·         A single lane of southbound Fourth Avenue S will be closed at S Spokane Street during the day, from 7 a.m. until 2 p.m.
 
Wednesday, March 21
 
·         The eastbound First Avenue S off-ramp from the West Seattle Bridge will be closed overnight, from 9 p.m. until 5 a.m. Thursday morning.  The Fourth Avenue S off-ramp will remain open, providing access to motorists wishing to exit into SODO and/or downtown.
 
Friday, March 23
 
·         Westbound access to the Lower Spokane Swing Bridge will be closed overnight, due to a closure of westbound lower S Spokane Street at E Marginal Way S, from 10 p.m. until 5 a.m. the following morning.  Traffic to West Seattle will be detoured via the First Avenue S Bridge.  (This closure is necessary for the demolition of the old westbound Harbor Island off-ramp, which has been replaced.)
 
·         First Avenue S at the intersection with S Spokane Street will be closed overnight, from 9 p.m. until 5 a.m. the following morning.  Northbound traffic will be detoured east on lower (surface) S Spokane Street to Fourth Avenue S, at which point motorists can turn to head north.  Southbound traffic will be detoured west at S Hanford Street.
 
·         The eastbound First Avenue S off-ramp from the West Seattle Bridge will be closed overnight, from 9 p.m. until 5 a.m. Thursday morning.  The Fourth Avenue S off-ramp will remain open, providing access to motorists wishing to exit into SODO and/or downtown.