I can't answer the question but I can add to this thread... I cracked open Journey for the first time last night and also tried out the old creek bridge. It seems that it wasn't long enough for the part of the small creek that I placed it on, despite the fact that the road tiles were green on either side, so a few of my workers got stranded on the other side and no one would use it.
I think you have to try it on a thinner stretch of stream.
