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General vehicular traffic across the Hammersmith Bridge makes riding up Castelnau and crossing by the Bridge unpleasant. I imagine — though I have no information on this point — that it can be made safe and usable for cyclists and pedestrians at much less cost than rebuilding it for general traffic. If the latter solution is adopted, it cannot possibly be delivered before end 2023 when transport patterns in west London may look altogether different than they did several years ago.
Why? All that's missing is funding to repair it. Admittedly, that will be a major job, but it's still by far the best option. The threat hanging over all this is that they might demolish the bridge and build a modern, higher-capacity one, or a pastiche bridge, in its place. Sure, it's Grade II* listed, but that can theoretically be overcome. So far, I've seen no suggestion that it's not repairable, though, and I expect that this will eventually happen. It could be some time.