COMPOSITION
I like how you have composed this shot so that the bridges lead the eyes through the frame, and then rest on teh structure on the right. It is a neat contrast of the bridges.
TECHNIQUE
Your focus does seem to be a bit off. Were you using a tripod? If not, and you don't have one, a lot of times you can get by with using a bag with flour, rice, or something like that in it as a portable bean bag. Put the bag on something, then rest the camera on it. this eliminates any camera/hand shake. Or, since it looks like it was a bright day, I would also try to use a fast shutter speed.
You have some nice colors, but overall teh picture is a little flat. Maybe add some saturation or play with the contrast levels some if you can. That may help bring out the details in your picture. Also, if you have a polarizer, that may have helped your colors have more depth to them.
OVERALL EFFECT
This is a nice picture to look at, and you have met the challenge well.
This would be a much better shot if it were clearer. The composition has some nice elements to it with both bridges side by side. The old bridge is far more interesting. A lot of perspectives are possible for this place that could be very effective in terms of conveying a little message.
Nice contrast between the two bridges. Challenge well met (two for the price of one!!) Color seems pretty good. Focus - the cement bridge seems to look much better than the steel one. 5 Swash
Great shot of the two bridges, nice colours too, I like the concrete bases on the old one with the different colours in them, and then of course the stark white/gray of the concrete of the new bridge with the shadows from the older bridge. Nice job.
Detail is ruined by a much too low jpeg quality. This one is 40 out of 150kb, there is a lot of room for better compression (less of it!). It would look less soft, edges sharper and render more detail.