Only today, my parallel-boss was explaining to me that only Canadian Codes have started allowing monolithic bridge instead of traditional simply supported configuration.

And evening, I get this news. Though only top slabs seems like monolithic construction, and main bridge girder is still piece-wise simply supported. It's enlightening to hear from the seniors.

Moreover, absence of R/f in top slab seems to be a demo case of new age "Just do it with our admixture (chemicals)" pitching we get from some of the manufactures.

EDIT: Looking from the picture: My first guess is support settlement of one of the intermediate columns. One more thing, I found strange was that we generally tend to avoid Steel Columns going below the top level of the water in the stream, generally we keep Concrete coming few metre above the water level and than steel starting, but the far off columns stills seems to be going into the water. Even though, it's not that rare, all offshore steel platform have still going into water but they are designed with far stringent specifications and definitely not for such small scale bridges.