Just in from WSDOT: “Crews must close two right lanes on northbound I-5 approaching I-90 to perform temporary emergency repairs on an expansion joint. Crews will weld the steel expansion joint cover in place.” This could take at least an hour or so and is apparently under way now; more work is planned later tonight (and those same two lanes will be closed 10 pm-4 am as a result), but bottom line, if you have to head to I-5 right now, wait if you can, or find a way to get onto I-5 from mid-downtown.