This timelapse is called Seattle Viaduct Demolition Time Lapse, and was created by an awesome Primelapse user on YouTube on YouTube. It is 00:03:15 long. The last time we checked (on March 31st, 2015), it had around 24,000 plays on YouTube
A five-day time lapse of the demolition by Rhine Demolition of the south mile of the Alaskan Way Viaduct in Seattle. A photo was taken every 2 to 3 minutes from the 13th floor of the Norton Building. Time lapse video by Marcus Donner/Puget Sound Business Journal.