The city is doing work on Firestone Boulevard on the bridge that passes over the San Gabriel River. They have closed half of the bridge while they rebuild that half. The other half is for traffic. That's six lanes of traffic down to two lanes. What a gridlock during rush hours.
They seem to be moving along quite well, though. The entire project is due for completion in June 2015. Go here to see a fuller project description. You need to scroll down a little to get to the bridge article.