It is situated on the reach above Grafton Lock.

The weir and lock, the last remaining on the Thames, were removed that year leaving the mooring cuts which are still in use.

There was a lock keeper at the weir and a walkway across which is the precedent for the current bridge.

The flash lock was notoriously difficult and Thacker quoted Henry Taunt: "I recollect one winter in passing this very weir, when lying on my back in the boat to get through, scraping a fair amount of skin off my nose and face though contact with the bridge whilst going under it.

"[1] This Oxfordshire location article is a stub.