Three Mills Wall River Weir is a weir on the Bow Back Rivers, in the London Borough of Newham, England, near to Three Mills. It was built in 2009, when the Bow Back Rivers were refurbished to make them a key feature of the Olympic Park, London, and maintains water levels through much of the park in conjunction with the Three Mills Lock and sluice on the Prescott Channel.
Even though Three Mills Wall River Weir was refurbished to make a key feature of the Olympic Park, it was built in 2009