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Two lanes of southbound Interstate 5 at Federal Way are closing this weekend — the most disruptive of at least eight Seattle-area lane closures the next few days.

The I-5 work will occur from 8 p.m. Friday until 6 a.m. Monday, where I-5 meets Highway 161, the Enchanted Parkway area.  The carpool lane and left general-traffic lane will be blocked, while crews work on the drainage system and extend a pipe beneath the roadway. The pipes are meant to clear away runoff that is a byproduct of the Federal Way Triangle project, according to Broch Bender, spokeswoman for the Washington State Department of Transportation.

An average 167,000 cars a day pass the Triangle in the two directions of I-5. DOT says drivers should plan for delays, and check the online Seattle Traffic Map.

In other locations:

* Denny Way will be reduced to one lane each direction at Sixth Avenue North on Saturday from 9 a.m. to 3 p.m.

* Fairview Avenue North will close from Mercer Street to Valley Street for underground electrical installation from Saturday at 8 a.m. until Monday at 5 a.m.  Traffic will be detoured, and the South Lake Union streetcar taken out of service.

* The westbound West Seattle Bridge exit to Delridge Way will close Saturday from 5:45 a.m. to 4 p.m., to replace a live-stream traffic camera.

* Eastbound I-90 traffic at the Mount Baker Tunnel will be shifted into the center Express lanes from 11:59 p.m. Saturday until 8 a.m. Sunday, for lighting maintenance in the tunnel.

* On the Montlake Bridge, one lane each direction will close Saturday from 7:30 a.m. to 1 p.m. for deck repairs.

* Highway 520′s right westbound lane will close near Foster Island from 5 a.m. to 9 a.m. Sunday for inspection.

* And on I-405 in Renton, the right northbound lane will close from sunrise to noon Monday through Thursday, so crews can grind uneven pavement on the shoulder before the next freeze. The state Department of Transportation is trying to prevent puddles that can turn icy, at the site pictured here.