The lock was rebuilt in 1900, when its length was reduced to , and a second lock of the same size was built next to it in 1931. Extreme high tides continued to flow over the top of the lock, inundating the Limehouse Cut until 2000, when a flood wall and a second set of gates were installed, enabling to lock to be used at all states of the tide and preventing overtopping. Funding for the project was provided by the London Waterway Partnership.
In 1900, the lock was modified so that its length decreased to , and a second identical lock was built next in 1931. Despite high tides frequently spilling over the top of the lock, flooding the Limehouse Cut until 2000, when a flood barrier and additional gates were installed, enabling the lock to operate at all tide levels and preventing overflow. Funding for this project came from the London Waterway Partnership.