Liverpool’s Old Dock — From Muddy Pool to World Port

BEFORE THE OLD DOCK, THERE WAS THE POOL

Long before Liverpool possessed miles of docks, a tidal inlet cut inland from the River Mersey.

It was known simply as the Pool.

Archaeological research describes it as a natural tidal creek, fed by streams from higher ground and extending for almost 1.5 kilometres at high tide. It played an important role in early Liverpool, providing sheltered water where vessels could unload, be repaired and eventually be built. [1]

The Pool is also closely connected with the city's name.

The earliest recorded form, Liuerpul, appears around the end of the twelfth century. The interpretation generally accepted by modern place-name specialists is approximately “pool with thick water” — referring to the character of the tidal inlet rather than to anything connected with the Liver Bird. [2]

That does not mean people in medieval Liverpool necessarily called it “the Muddy Pool”. Its historical name was the Pool. “Muddy pool” is a useful modern shorthand for the likely meaning behind Liverpool.

LIVERPOOL HAD A PROBLEM

By the late seventeenth century, Liverpool's trade was growing — but its natural harbour was becoming increasingly inadequate.

Parts of the Pool were already being reclaimed. It was shallow, crowded with shipbuilding activity and increasingly unsuitable for larger vessels. The archaeological study of the Old Dock suggests that at low tide the Pool may have been almost empty. [1]

Then there was the Mersey itself.

Liverpool had to contend with a very large tidal range, strong currents, exposed anchorages and bad weather. Cargo could be transferred between vessels and shore using smaller boats, but this was slow and expensive.

As Liverpool's merchants looked increasingly towards Ireland, Europe and the Atlantic, the limitations of the harbour became a serious commercial problem.

They needed a way of defeating the tide.

THE IDEA: TRAP THE WATER

By 1707, a proposal had emerged for something much more ambitious than another quay or landing stage: an enclosed wet dock.

Liverpool MPs and merchants Thomas Johnson and Richard Norris were central to pushing the scheme forward.

In 1708 Johnson travelled to London to seek advice from engineer George Sorrocold, who had experience of the Howland Dock at Rotherhithe. Later that year Liverpool's Town Council formally requested plans for its proposed dock.

Then, in 1709, Parliament passed Liverpool's first Dock Act.

It gave the Corporation authority to construct the dock and levy dues on ships using the harbour. [1]

Liverpool had committed itself.

Now somebody had to build it.

THOMAS STEERS

That job fell to Thomas Steers.

Steers began work in May 1710, and his solution was ingenious.

Instead of simply digging a dock into dry land, the structure was built within the tidal area of the lower Pool.

Walls enclosed part of the existing inlet. Gates at the river entrance could admit ships when sufficient water was available and then retain the water as the Mersey tide fell.

The ships inside remained afloat.

That sounds straightforward today. In the early eighteenth century, it was a formidable engineering project.

The dock was constructed largely by hand. Workers had to contend with tidal water battering temporary cofferdams while streams continued to discharge into the Pool from inland.

Beneath them was another problem: mud.

Later accounts describe dock walls being carried down through soft ground until sufficiently firm foundations were reached. [1]

The very landscape that appears to have given Liverpool its name had become the material through which Liverpool's future was being built.

31 AUGUST 1715

On the morning of 31 August 1715, three ships entered the new dock.

Their names survive because Lancashire diarist Nicholas Blundell recorded the event:

Mulbury
Batchlor
Robert

Mulbury entered first. [1]

Some construction work remained to be completed, with the archaeological report treating the dock as fully finished in 1716.

But 31 August 1715 became the defining date.

Liverpool's Old Dock was open.

It is recognised as the world's first commercial enclosed wet dock — an important distinction because other wet docks had existed, including Howland Dock, but they were not designed as commercial cargo-handling docks in the same way. [1][3]

Liverpool had pioneered something other ports would copy.

SO HOW BIG WAS IT?

The exact figures vary slightly between historical descriptions, but the archaeological study gives a clear picture.

The Old Dock was roughly rectangular and contained about 3½ acres of water.

One historical description recorded it as approximately 195 yards long, 85 yards wide at the eastern end and 95 yards wide at the western end, with entrance gates about 33 feet wide and a minimum water depth of around 14 feet.

It was said to be capable of accommodating about 100 square-rigged vessels. [1]

For early eighteenth-century Liverpool, this was enormous infrastructure.

But its real importance was not its size.

It was what the dock allowed merchants to do.

FROM TWO WEEKS TO A DAY AND A HALF

Before the Old Dock, handling a ship's cargo could be painfully slow.

The archaeological report, drawing on earlier dock histories, records that unloading could take 12 to 14 days.

With a vessel floating securely alongside the new dock, the same process could reportedly be reduced to around a day and a half. [1]

That statistic gets to the heart of why the Old Dock mattered.

Ships were expensive things to leave sitting idle.

If Liverpool could turn vessels around faster, merchants could reduce handling costs and send ships back to sea sooner.

The dock therefore gave the port a major competitive advantage.

National Museums Liverpool describes its impact as immense, with established ports including Chester, Bristol and London losing significant trade as Liverpool expanded during the eighteenth century. [3]

Liverpool had not simply created somewhere more convenient to park ships.

It had changed the economics of using the port.

ONE DOCK WASN'T ENOUGH

The success of the Old Dock created another problem.

Liverpool wanted more docks.

The original structure became the starting point for a rapidly expanding system of enclosed docks, basins, graving docks, quays and warehouses.

As the port expanded, the landscape around the Pool changed just as dramatically.

Reclamation had already begun before construction of the Old Dock, but development accelerated during the early eighteenth century. The archaeological report records extensive leasing, reclamation and building around the former Pool by 1718. [1]

Gradually, the natural inlet disappeared beneath streets and buildings.

But its course still influenced the shape of Liverpool.

The Pool had helped determine where the medieval town grew.

Then the Old Dock helped determine where the commercial city grew.

THE UNCOMFORTABLE SIDE OF LIVERPOOL'S SUCCESS

There is no honest account of Liverpool's eighteenth-century growth that can leave out the transatlantic slave trade.

Liverpool merchants were involved before the Old Dock opened.

Indeed, Thomas Johnson, one of the men most closely associated with promoting the dock, was himself involved in slave trading. Historic England records his financing of an early Liverpool voyage to West Africa in 1700 aboard The Blessing. He was also involved in the Virginia tobacco trade, whose production relied heavily on enslaved labour. [4]

It would be too simplistic to say that the Old Dock caused Liverpool's rise in the slave trade.

It did not.

But improved docks increased Liverpool's ability to handle ships and Atlantic commerce efficiently.

And as Liverpool's maritime infrastructure expanded, so did its involvement in commerce connected with slavery — including ships trafficking enslaved Africans and commodities produced through enslaved labour.

By the 1750s, Liverpool had become Britain's leading slave-trading port. [5]

The Old Dock therefore belongs to two inseparable histories.

It was an extraordinary achievement in civil engineering.

And it became part of the infrastructure of an Atlantic trading system in which enormous wealth was produced through human exploitation.

Both matter.

SUCCESS EVENTUALLY KILLED THE OLD DOCK

The Old Dock worked so well that the port around it kept growing.

Eventually Liverpool outgrew its revolutionary first dock.

By the early nineteenth century it had become too small for many of the larger vessels using the port. Silting was also a problem, while the surrounding district had become densely packed with warehouses and other buildings.

Engineer John Rennie recommended its closure in 1810, and an Act of Parliament passed in 1811 provided for the dock eventually to be filled.

Liverpool's merchants resisted.

The archaeological history records that opposition delayed closure for around 15 years. [1]

But the Old Dock's days were numbered.

31 AUGUST 1826

There is a wonderful symmetry to what happened next.

The first ships had entered on 31 August 1715.

The final ship left on 31 August 1826.

Exactly 111 years later.

After that last vessel departed, the Old Dock was filled in. [1]

The engineering wonder that had helped transform Liverpool disappeared beneath the city.

Or at least it appeared to.

THE CUSTOM HOUSE

Liverpool needed the land for another enormous symbol of its commercial importance.

Architect John Foster Jr was commissioned to design a new Custom House.

Its foundation stone was laid on 12 August 1828, and the huge building eventually opened in 1837.

But the Old Dock was not simply demolished out of existence.

Its walls were useful.

During construction of the Custom House they continued to act as retaining structures while the former dock was filled and foundations were created.

Archaeological research concluded that approximately 95 per cent of the Custom House stood within the footprint of the Old Dock. [1]

Liverpool had literally built one generation of its history inside another.

The Custom House itself was badly damaged during the Second World War and was demolished after the war.

Once again, the site changed.

And once again, the Old Dock remained beneath it.

REDISCOVERED IN 2001

Almost 175 years after the dock closed, archaeologists investigated the site ahead of the huge redevelopment that became Liverpool ONE.

In 2001, substantial remains of the Old Dock were uncovered.

Walls. Brickwork. Timbers. Quayside structures.

Deposits from the dock — and evidence connected with the earlier Pool beneath it.

The discovery was remarkable not simply because something survived, but because so much did.

Today visitors can see a large section of dock wall rising more than 20 feet from the bed of the former Pool beneath Liverpool ONE. [3]

Above it is one of the busiest parts of modern Liverpool.

Below it is the infrastructure of 1715.

ONE LAST LEGACY: OLD DOCK SILL

The Old Dock even left Liverpool a measurement.

The level of the sill beneath its entrance gates became known as Old Dock Sill — ODS.

Long after the dock itself disappeared, that level continued to be used as an important Liverpool datum for dock, tidal and engineering measurements.

A Mersey Docks and Harbour Board statement from 1872 described the Old Dock Sill as the datum to which dock levels were referred, while historic Liverpool tide records were also measured relative to it. [6]

Even after the dock had vanished from the surface, engineers were still measuring Liverpool from it.

FROM THE POOL TO A WORLD PORT

The Old Dock did not turn Liverpool into a world port overnight.

Liverpool's rise depended upon geography, merchants, shipbuilding, expanding Atlantic markets, later dock construction, industrialisation, migration and many other forces.

But 1715 was a decisive turning point.

Liverpool took the natural tidal creek around which the old town had developed and transformed part of it into a piece of engineering infrastructure.

Ships no longer had to work entirely around the fall and rise of the Mersey.

Cargo could move dramatically faster.

Trade grew.

More docks followed.

The waterfront expanded.

And the Pool gradually vanished beneath the commercial city it had helped create.

More than three centuries later, you can walk through Liverpool ONE without seeing any of this.

But descend beneath the modern streets and the walls are still there.

Liverpool's journey from the Pool to a world port is still sitting underneath our feet.