Three-week closure of SR 99
When the new SR 99 tunnel is ready to open, travelers will experience the longest major highway closure the Puget Sound Region has ever seen. The closure is currently planned to begin on Jan. 11, 2019.
WSDOT will need to close SR 99 through downtown Seattle for approximately three weeks to realign the highway into the tunnel. During this closure both the viaduct and the tunnel will be closed. This disruption is unavoidable due to the large amount of work involved in re-aligning SR 99 with the new tunnel. Additional ramp closures mean up to six weeks of traffic disruption.
#REALIGN99 IS COMING JAN 11: START MAKING YOUR PLAN
We will need everyone's help during the closure to avoid gridlock. Commuters and employers, start thinking now about how you can change commute patterns:
- Shift your travel time to avoid the busiest times on the roadway
- Bike or walk to work or school
- Start or join a carpool, vanpool or vanshare
- Start a telecommute program for employees
- Use transit, particularly light rail and King County Water Taxi
- Stay off the road: work from home, postpone discretionary trips, take time off
- Be prepared for your new route when the closure ends and the new tunnel opens.
Ideas and resources:
What: Approximately three-week-long closure of SR 99, from the Battery Street Tunnel to South Spokane Street
When: Scheduled to begin Jan. 11, 2019.
Why: To complete the highway and eight ramps connecting the new tunnel to SR 99 and local streets. This WSDOT blog post explains the work that has to happen to open the tunnel to drivers.
Ramps near stadiums closed for five to six weeks
The large amount of work required at the tunnel’s south end near the stadiums means that ramps will close sooner and open later than the rest of the highway. The SR 99 southbound off-ramp to South Atlantic Street will close approximately one week before the main closure begins. The new SR 99 northbound off-ramp to Alaskan Way S. and downtown will open up to two weeks after the tunnel opens to drivers.
After the closure ends
When the closure ends, the tunnel will open and SR 99 drivers will have a direct route from the stadiums to the Space Needle. The viaduct and Battery Street Tunnel will both be permanently closed in preparation for the start of viaduct removal.
Labels for ramps show in maps above. SB = southbound; NB = northbound. View larger sequencing maps here.
|SR 99 ramps before and during highway closure (slides 1-3)|
|A||SB off-ramp to South Atlantic Street|
|B||NB on-ramp from South Royal Brougham Way|
|C||Columbia Street SB on-ramp|
|D||Seneca Street NB off-ramp|
|E||Western Avenue NB off-ramp|
|F||Elliott Avenue SB on-ramp|
|G||Western Avenue NB on-ramp (into Battery Street Tunnel)|
|H||Western Avenue SB off-ramp (from Battery Street Tunnel)|
|SR 99 ramps after tunnel opens (slides 4-5)|
|1||SB off-ramp to Stadiums, Interstates and Ferries (after leaving tunnel)|
|2||NB on-ramp from South Royal Brougham Way (into tunnel)|
|3||NB off-ramp to Alaskan Way S./Downtown (before tunnel)|
|4||SB on-ramp from South Dearborn Street|
|5||NB off-ramp to Mercer Street/I-5 (after leaving tunnel)|
|6||SB on-ramp from Sixth Avenue North (into tunnel)|
|7||SB off-ramp to Denny Way/Downtown (before tunnel)|
|8||NB on-ramp from Harrison Street|
We recognize that this closure will bring significant disruption to local and regional traffic patterns. WSDOT and its partner agencies are implementing a variety of measures to keep people moving, and ask commuters and employers to plan ahead and adjust commute habits where possible.
Trip planning resources
|Adjust your travel times & know before you go|
|Transit and park & rides|
|Work from home|
|Rideshare: Carpool, vanpool and vanshare|
King County Water Taxi