Lane closures on Stewart Street in Seattle for up to three months will affect many surrounding roads. Other closures include I-90 for the Blue Angels flyover and University Bridge for improvements.

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Motorists who use Stewart Street will find potential delays between I-5 and downtown this week, and a new plot twist.

Instead of closing a lane or two along the curbside, Seattle City Light will close an interior lane Wednesday — so general traffic must split around the worksite, from Boren Street to Ninth Avenue.

“It can throw some people off, when you go to a center lane,” said spokesman Scott Thomsen.

Crews are repaving after they trenched the street to install new electric lines. Lane closures will continue for three months, and fluctuate to either a curb lane or inside lane, along the one-way road to downtown.

There will always be two general lanes and a bus lane at morning peak from 5 to 10 a.m. Other times, a second lane will close. After paving is completed to Ninth Avenue, traffic conditions should improve when crews continue west to Sixth Avenue, where the job ends, and where the bottleneck will be farther from I-5, Thomsen said.

The new power wires are related to the Denny Substation Project to be energized in Spring 2018, but surrounding hookups won’t be finished until 2020. It’s the city’s first new large power station in three decades.

Many other streets just north of downtown are partly or fully blocked by trenching and paving.

For several months, bus and car drivers on Stewart have navigated through one or two blocked lanes during utility work, as well as private building construction. At midday Monday, a deep trench crossed the intersection where Stewart meets Eighth Avenue, taking two lanes where the former Greyhound bus depot will become a hotel.

In the end, the right lane of Stewart will be concrete for buses, while other lanes will be asphalt, Thomsen said.

In other traffic updates:

• The South King Slowdown will take a weekend off for Seafair, but the Duwamish River bridge will be reduced to two lanes Aug. 12-15, for expansion joint and drainage repairs.

• The I-90 floating bridge will close for Blue Angels stunt flights, starting Thursday from 9:45 a.m. to noon, and then Thursday through Sunday from 1:15 p.m. to 2:40 p.m. Express lanes will close an hour earlier.

• University Bridge will close again this weekend, from 8 p.m. Friday until 5 a.m. Monday.

• Repainting at the Columbia River I-90 bridge in Vantage, Kittitas County, will continue to block one lane eastbound, causing delays throughout the summer.