Wow, this is very nice. I just love driving over the I-405 bridge when it's dark. Isn't this taken from the Portland Waterfront? I haven't been this close to the Willamette, so I wouldn't know. It looks like a great place for photographs.
I love this shot. I've done some HDR from that exact spot though and one thing I noticed is that some of the buildings color has been altered in yours. For example on the one there is a red light on one side and green on the other when they are actually both red. I was wondering how you created that effect?
In the holiday season most of the buildings in Portland change to a more festive coloring on the exterior lights so all you have to do is go to the same place in December. No photoshop on the lights needed, lol.