The ground-breaking is happening right now, featuring Patty (allegedly "in trouble", but all over town this week) Murray, U.S. Transportation Secretary Ray LaHood, Governor Christine Gregoire, Congressman Jim McDermott, and Mayor Mike McGinn.

Watch it live right here:

Seattle Channel Video can be played in Flash Player 9 and up

As Murray's office notes:

The Mercer Corridor Project, which will help fix the decades long “Mercer Mess,” is funded under the nationwide TIGER (Transportation Investment Generating Economic Recovery) Grant program that Senator Murray created and fought to include in the American Recovery and Reinvestment Act. This project will put people to work, help reduce congestion, and spur economic growth.