9:31 PM: This might not last too long but in case you got stuck in the backup or have seen it – a crash on the northbound Alaskan Way Viaduct is requiring a debris cleanup, and traffic is temporarily stopped because of it (live cam here). That includes police blocking the ramp to northbound 99 from the West Seattle Bridge. So if you have to head toward downtown – take note.

9:41 PM: Just got info from Seattle Police via Twitter:

The viaduct is closed NB between WSB and Seneca St due to collision. Road is estimated to be closed for an hour.

— Seattle Police Dept. (@SeattlePD) November 19, 2014

We’re adding the live camera as an image atop this report, so you can see firsthand when it clears.

10 PM: Per scanner, police were trying to figure out how to get cars off 99. In the meantime, they also say a street sweeper will arrive in 10 minutes or so.

10:45 PM: Now open again.