c 1870.

Jessops north entrance lock (left) and Brunel's south entrance lock (right) which was constructed 1844-49 to accommodate larger vessels.
In 1864 Thomas Howard was requested to prepare proposals for the improvement of dock entrances and approaches. This included :-
a new junction lock, 60' wide offering an improved angle of entry to the floating harbour (entered near Merchants Dock)
a new entrance lock, 60' wide and 3' deeper at the sills than the existing one to be situated further downstream, opposite Rownham to have an easier line of approach