I asked Steve T about this before but realise I am still conflicted!
The council roads info shows the bridge over the river as part of the closure of the A939 to Ballater. The diversion is shown as continuing east along Strathdon until heading south through Logie Coldstone.
The same image shows the B976 open from the south side of the bridge to Crathie.
Steve , did I misunderstand that you said the bridge could be crossed ?