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I've tried a few tricks in milkshape that would usually fix this issue, but tuns out that it's the UV map! Your UV map seems to overlap the actual UV map area (if that makes any sense :P) And that seemed to have done the trick. I guess the game didn't know what the offset of the UV map was because of that.
Also, love to see you working on that bridge! I think it's simply amazing ^-^
I made sure that everything was within the texture area, as displayed right here, which seemed to have fixed it. I've only UV mapped the supporting part of the bridge though, not sure if you want the edited OBJ part, since I did the UV mapping pretty fast and I guess I might have missplayed some islands...