Travelers moving between Seattle, Mercer Island, Issaquah, and the Eastside face overlapping highway restrictions from Friday, July 17, through Monday, July 20, 2026. Washington State Department of Transportation plans include a full overnight closure of eastbound Interstate 90, a prolonged westbound I-90 lane reduction near Issaquah, and a weekend closure of Montlake Boulevard with several State Route 520 ramps.
The latest official update matters because WSDOT revised part of the plan on July 17. Westbound I-90 work hours changed, an associated ramp closure was added, and planned State Route 99 work was postponed, leaving the I-90 and Montlake area restrictions as the main confirmed pinch points for this weekend.
- Eastbound I-90: All lanes close from Rainier Avenue South in Seattle to 77th Avenue Southeast on Mercer Island from 11:30 PM July 17 to 7:30 AM July 18.
- Westbound I-90: Two right lanes near Issaquah close from 8 PM July 17 to 9 AM July 19.
- Issaquah ramps: The Front Street on-ramp and 17th Avenue Northwest off-ramp close with the westbound work.
- Montlake Boulevard: Both directions close near SR 520 from 10 PM July 17 to 6 AM July 20.
- SR 520 access: Several Montlake ramps close, but the westbound SR 520 off-ramp to northbound Montlake Boulevard stays open.
- Latest change: WSDOT postponed the planned SR 99 work and updated the I-90 lane reduction details.
What changed in the July 17 update
WSDOT first published the regional closure plan on July 13 and modified it on July 17. The updated notice says the planned SR 99 work is postponed, while the westbound I-90 lane reduction hours were adjusted and another ramp closure was added.
That distinction is important for route planning. Drivers should not build a detour around an outdated SR 99 restriction, but they should expect pressure to spread from the confirmed I-90, SR 520, and Montlake work onto parallel streets and crossings.
The agency says several projects are resuming after a temporary construction pause during world championship soccer matches in Seattle. WSDOT warns that simultaneous restrictions can create longer and less predictable travel times well beyond the work zones as drivers move to alternate routes.
The primary schedule comes from the WSDOT July 17 regional congestion update. Local station KING 5 independently summarized the same eastbound I-90 closure, Issaquah lane reduction, and Montlake restrictions on July 17.
Eastbound I-90 closes overnight
All eastbound I-90 lanes are scheduled to close from Rainier Avenue South in Seattle to 77th Avenue Southeast on Mercer Island. The closure starts at 11:30 PM Friday, July 17, and runs until 7:30 AM Saturday, July 18.
WSDOT says crews will perform scheduled maintenance in the Mount Baker and Mercer Island Lid tunnels. The work includes testing fire suppression and emergency systems, cleaning drains, replacing lights, and sweeping the roadway.
Drivers crossing Lake Washington late Friday should choose a different route before reaching the closure boundary. Waiting until the Rainier Avenue South area to reroute can add local street movement at the same time other travelers are making the same decision.
The I-90 floating bridge is the direct corridor between Seattle and Mercer Island, so this is not a minor ramp restriction. Anyone heading toward Bellevue or farther east during the overnight window should check the live map before departure and leave enough time for a different lake crossing.
Westbound I-90 loses two lanes near Issaquah
Two right lanes of westbound I-90 near Issaquah are scheduled to close from 8 PM Friday, July 17, to 9 AM Sunday, July 19. The Front Street on-ramp and 17th Avenue Northwest off-ramp are also part of the closure plan.
This work belongs to a paving and expansion joint project covering about two and a half miles of westbound I-90 near Issaquah. The road remains open, but the reduction removes a large share of normal capacity over a long weekend window.
Travelers driving toward Seattle from the Cascade foothills should not treat an open road as a normal road. A two lane reduction can produce stop and go traffic before the visible work zone, especially when traffic from local events, hiking areas, and weekend trips converges.
If an Issaquah ramp is essential to a hotel, event, or meeting plan, check the exact interchange before setting out. A route that looks reasonable at the regional level may fail at the last mile when the required on-ramp or off-ramp is one of the closed movements.
Montlake Boulevard and SR 520 restrictions last until Monday
Montlake Boulevard closes in both directions between East Hamlin Street and East Louisa Street from 10 PM Friday, July 17, to 6 AM Monday, July 20. The closure affects access around the SR 520 interchange and the Montlake neighborhood for the full weekend.
The Montlake Boulevard on-ramps to eastbound and westbound SR 520 will close. The eastbound SR 520 off-ramp to Montlake Boulevard, a 300 foot section of East Roanoke Street west of Montlake Boulevard, and Lake Washington Boulevard between Montlake Boulevard and 24th Avenue East will also close.
One useful exception remains: WSDOT says the westbound SR 520 off-ramp to northbound Montlake Boulevard stays open. That does not make the interchange normal, but it may preserve a specific arrival movement for travelers coming from the Eastside.
People walking, biking, and rolling will retain a path across SR 520 on Montlake Boulevard, with a limited detour south of the highway. Crews are beginning removal of an existing sign structure and installing smaller replacements developed after community feedback.
How to plan a Seattle or Eastside trip
Start with the time window rather than the road name. Late Friday travel is exposed to the eastbound I-90 closure, the westbound Issaquah reduction, and the start of the Montlake shutdown at nearly the same time.
Saturday daytime removes the full eastbound I-90 closure from the equation after 7:30 AM, but the westbound lane reduction and Montlake restrictions continue. Sunday improves after westbound I-90 lanes reopen at 9 AM, while Montlake remains restricted until early Monday.
WSDOT recommends transit, park and ride options, flexible departure times, and real time traffic information. Its online Travel Center map and mobile app are the most useful final checks because weather can move construction schedules and traffic can shift quickly between parallel routes.
Travelers also should separate this weekend plan from the earlier Revive I-5 Ship Canal Bridge closure. That July 10 to 13 work has passed, while the current decision centers on I-90 and Montlake area access through July 20.
Do not rely on a navigation app opened hours before departure. Refresh it shortly before leaving, confirm that the preferred ramp is open, and keep one alternate route that avoids the same bridge or interchange rather than feeding back into the restriction.
Decision matrix
| If your trip uses | Best planning move |
|---|---|
| Eastbound I-90 late Friday | Leave before 11:30 PM or select another Lake Washington crossing before reaching Rainier Avenue South. |
| Westbound I-90 from Issaquah | Expect reduced capacity through 9 AM Sunday and verify the Front Street and 17th Avenue ramp movements. |
| Montlake Boulevard near SR 520 | Plan around the full weekend street closure and confirm which SR 520 ramp your route actually needs. |
| Westbound SR 520 to northbound Montlake | WSDOT says this off-ramp remains open, but recheck the live map for neighborhood congestion. |
| A time sensitive airport, rail, or event connection | Add a larger buffer, use live traffic immediately before departure, and keep a second route that avoids the affected interchange. |
- Friday night carries the most overlap: Multiple restrictions begin within a few hours of one another.
- Saturday is not fully clear: Eastbound I-90 reopens in the morning, but Issaquah and Montlake work continues.
- Ramp details matter: A highway may remain usable while the exact entrance or exit needed for a trip is closed.
- Do not plan around postponed SR 99 work: The latest WSDOT notice removed that restriction from this weekend plan.
- Refresh before departure: Weather and traffic can change the best route even when the construction schedule holds.
When does eastbound I-90 close in Seattle?
WSDOT plans to close eastbound I-90 from Rainier Avenue South to 77th Avenue Southeast from 11:30 PM July 17 to 7:30 AM July 18, 2026.
How long are the westbound I-90 lane reductions near Issaquah?
Two right lanes are scheduled to close from 8 PM July 17 to 9 AM July 19. The Front Street on-ramp and 17th Avenue Northwest off-ramp also close.
Is Montlake Boulevard open this weekend?
No. WSDOT says both directions close between East Hamlin Street and East Louisa Street from 10 PM July 17 to 6 AM July 20.
Is every SR 520 ramp at Montlake closed?
No. Several ramps close, but WSDOT says the westbound SR 520 off-ramp to northbound Montlake Boulevard remains open.
Is the planned SR 99 work still happening?
WSDOT’s July 17 update says the planned SR 99 work was postponed. Travelers should still verify the live map before departure in case conditions change.
