Tony, I believe this is your bridge. I believe it's called the Big Tujunga Narrows Bridge, and it apparently spans part of the "Big Tujunga Canyon" on the Angeles Forest Highway.

The only problem I have is that the Google Maps shot doesn't seem to match the images I was able to find here and here. The images seem to show the road curving much more sharply at either end of the bridge.

But that's all I was able to find.