[4] Canning Half Tide Dock was built by Jesse Hartley between 1842 and 1844, also opening in 1844.

[4][5] Originally having two 45 ft (14 m) lock entrances to the Mersey,[4] the north gates were sealed with a concrete dam in 1937.

[citation needed] The south gates are modified to accommodate a valve to admit river water.

To the outside of the river entrances are two granite octagonal gatemen's shelters, also designed by Hartley.

[4] Adjacent to the dock is the Pilotage Building, which opened in 1883[4] to manage the river's pilot boats.