This is the bridge sculpt above; a simple pattern with a bit of texture; many thanks to the noise brush :)
because really, who has time to sculpt deteriorated stone?
I also used masking combined with the layer brush to create the pattern; it was long-winded and there may have been an easier way that I don't know about
but at least I could symmetry it and the normal bake turned out quite well.
The image below is the bridge in udk; the texture is unfinished, just the general colour as I'm sure there will be tweaking to make everything work together nearer the end of the project.
(the grass is a temporary texture)