To my eye, something doesn't work here: though it's quite difficult to say what, exactly. Compositionally, perhaps your vanishing point could be more strongly placed in frame, rather than this halfway house between central and privileged on a thirds line. I'm also not sure the colours work well - that beige colour of tthe metalwork is rather neutral and uninteresting, and the brown is quite lifeless too: did you think about making this a monochrome image? The structure itself is very regular, which usually works better with a perfectly regular view of it, compositionally. Your slightly off-centred point of view adds an almost subconscious sense of disturbance to that regularity, and I don't think that helps either. There is a conflict between the very simple elements of the bridge in the upper part of frame - simple geometrical structures, beams and uprights against a clear blue - and the boards and lower area, where the lines become more chaotic and complicated. It's like two diffrent ideas of an image together, and that also makes it a tricky picture to appreciate on any one level. I think perhaps the question is, 'which part of this structure was it that really interested you?' - enough to shoot it with the evident care you have put into this.
After all this, I think it is that tension between the simplicity of the upper part of frame, and the complexity of the lower that most hurts this image: I've tried looking at the upper third (or so) and the lower two thirds (or so) separately (just by framing with the window), and i think what you have is a joining of two quite strong images in such a way that the impact of either is somewhat taken away.
Technically, of course there are a lot of strong things here: focus, presentation (I mean compression, and colour rendition) are absolutely fine, and there is strong detail present - the smoothness of the metalwork comes out, and that kind of texture is an element many people struggle with.
Nice perspective and taken during the right time of day for nice shadows. I want everything to be level, but it appears the danged structure itself is not level. :)