I-90, I-5, and the Alaskan Way Viaduct will all be impacted by lane closures.
A rainy weather forecast has canceled a planned repaving at the Highway 2 trestle, which will remain available for traffic from Lake Stevens to Everett this weekend, the state decided mid-day Friday.
Still, drivers will be pumping the brake pedal this weekend on several highways in King County, whether their favorite route goes north, south, east or west.
Two major closures will allow crews to repair concrete road decks, a third addresses a drainage problem leftover from a state job last year, and a fourth will relocate two Highway 99 lanes in Sodo — which the state is hyping as a prelude to a bigger fall shutdown.
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King County Metro Transit buses will be detoured around the parade route, and away from the Sodo highway closure. Sound Transit riders can expect slowdowns aboard I-90 buses to the Eastside.
• Interstate 5: Northbound traffic on the Ship Canal Bridge will be reduced to two lanes from 2 a.m. to 10 a.m. both Saturday and Sunday mornings, for deck patching.
New video by the Washington State Department of Transportation (WSDOT) shows how workers squirt epoxy and sprinkle gravel to form a fast-drying gray compote. To completely re-deck the bridge would require $55 million that’s unavailable in the budget until at least 2026, WSDOT says.
• Interstate 90 tunnel: The Mount Baker tunnel’s eastbound side will shrink to two lanes from 7 p.m. Friday until noon Saturday, then from 6 p.m. Saturday until noon Sunday.
Two drain covers and their seals are being replaced, to better withstand the weight of vehicles, where the roadway was restriped last year to add bus-carpool lanes, said spokeswoman Lisa Van Cise. “Once the striping was in place, it became clear several more catch basin and manholes were either closer to or underneath the flow of traffic,” she said. WSDOT needs this weekend’s closure and a future westbound closure to install permanent drains, she said.
• Interstate 90 Snoqualmie Pass: Ongoing concrete replacement west of the summit will continue to close lanes, often subjecting summer drivers to delays between one and two hours either direction.
In addition, work just started to repair rutted panels eastbound, causing single- or double-lane closures and a 55-mph limit, between Issaquah and North Bend.
• Alaskan Way Viaduct: The highway will close southbound from 9 p.m. Friday until 6 a.m. Sunday, from Battery Street to the West Seattle Bridge, so a short stretch of temporary southbound lanes near the stadiums can be shifted about 30 feet east, into their permanent position.
The Battery Street Tunnel itself will stay open, for trips between the north end and Belltown.
As soon as October, drivers will face a full three-week closure both ways while ramps are connected to the new bypass tunnel. Highway 99’s famous Puget Sound view, along with mid-downtown and Belltown exits, will permanently disappear. New interchanges will open at the stadiums and near Mercer Street near the tunnel portals.
Meanwhile, the lower Spokane Street Bridge into West Seattle remains under emergency closure, while city crews diagnose a hydraulic-fluid leak in one of the pivoting columns. This shutdown severs the bike trail to Alki Beach this weekend, but the city will provide a bike shuttle van for weekday commuters.