Weston Mersey Lock, opposite Weston Point; 600 feet long and 45 feet wide.
Bridgwater Lock, opposite Bridgwater Dock, Runcorn, 300 feet long and 45 feet wide.
Runcorn Old Quay Lock below Old Quay Docks, Runcorn, 300 feet long and 45 feet wide.
The three locks above mentioned connect the ship canal with the Mersey Estuary at their several points.
Two small barge locks at Walton and Stockton Heath, Warrington.
MANCHESTER SHIP CANAL
ENTRANCE LOCKS AT EASTHAM.
The largest canal locks hitherto contemplated are those designed by Col. Blackman for the proposed Nicaragua Canal. They are 700 feet long, 100 feet wide, and with 30 feet depth of water over the sill; whilst the lift proposed is from 50 to 120 feet. The filling of the lock-chamber was to be rapidly effected through 18 feet cast-iron pipes, built into the side walls along the whole length on each side, connected across the bottom of the lock-chamber by a series of 3-feet pipes, perforated by a number of 2-inch holes, from which the water was to be distributed over the whole area of the chamber in numerous small streams, so as to avoid any prejudicial agitation of the water. The emptying was to be similarly effected; and where a saving of water is important, the pipes were to discharge at the lower end into a series of long ponds, formed in terraces, so that most of the water might be used again for filling the lock. These arrangements are a large extension of the system of sluiceways, all along the side walls, with lateral openings, and of side ponds, already referred to. The most novel feature was the form of the caisson-gate, proposed to be constructed of wrought iron and steel, which, being increased in width towards the bottom, would become stronger in proportion to the depth, as the water-pressure increases.