Bristol Harbour
Bristol Harbour is the harbour in the city of Bristol, England. The harbour covers an area of. It is the former natural tidal river Avon through the city but was made into its current form in 1809 when the tide was prevented from going out permanently. A tidal by-pass was dug for 2 miles through the fields of Bedminster for the river, known as the "River Avon New Cut", "New Cut", or simply "The Cut". It is often called the Floating Harbour as the water level remains constant and it is not affected by the state of the tide on the river in the Avon Gorge, The New Cut or the natural river southeast of Temple Meads to its source.
Netham Lock at the east end of the 1809 Feeder Canal is the upstream limit of the floating harbour. Beyond the lock is a junction: on one arm the navigable River Avon continues upstream to Bath, and on the other arm is the tidal natural River Avon. The first of the floating harbour, downstream from Netham Lock to Totterdown Basin, is an artificial canal known as the Feeder Canal, while the tidal River Avon follows its original route. Downstream of Totterdown Basin, the floating harbour occupies the former natural course of the River Avon, whilst the tidal River Avon flows through an artificial channel known as the New Cut. This separation of the floating harbour and the tidal River Avon allows boats in the harbour to remain floating at low tide, reduces currents and silting and prevents flooding.
Between Bristol Temple Meads railway station and Hotwells, the harbour and the River Avon run parallel at a distance of no more than apart. Downstream of Bristol Temple Meads railway station, the floating harbour meanders through Bristol city centre, Canon's Marsh and Hotwells. At Hotwells, the floating harbour rejoins the tidal River Avon, via a series of locks, and flows into the Avon Gorge.
Bristol Harbour was the original Port of Bristol, but as ships and their cargo have increased in size, it has now largely been replaced by docks at Avonmouth and Portbury. These are located downstream at the mouth of the River Avon.
Sections, quays and harbourside features
History of Bristol docks
Bristol grew up on the banks of the Rivers Avon and Frome. Since the 13th century, the rivers have been modified for use as docks including the diversion of the River Frome in the 1240s into an artificial deep channel known as "Saint Augustine's Reach", which flowed into the River Avon. Saint Augustine's Reach became the heart of Bristol's docks with its quays and wharfs. The River Avon within the gorge, and the River Severn into which it flows, has tides which fluctuate about between high and low water. This means that the river is easily navigable at high tide but reduced to a muddy channel at low tide in which ships would often run aground. Ships had no option but to be stranded in the harbour for unloading, giving rise to the phrase "shipshape and Bristol fashion" to describe how ships and their secured cargo were capable of taking the strain of repeated strandings on the mud.Image:Bristol - Tallship in Cumberland Lock.jpg|thumb|right|upright|A tall ship in the Cumberland lock, Hotwells, during the 2004 Harbour Festival
As early as 1420, vessels from Bristol were regularly travelling to Iceland and it is speculated that sailors from Bristol had made landfall in the Americas before Christopher Columbus or John Cabot. After Cabot arrived in Bristol, he proposed a scheme to the king, Henry VII, in which he proposed to reach Asia by sailing west across the north Atlantic. He estimated that this would be shorter and quicker than Columbus' southerly route. The merchants of Bristol, operating under the name of the Society of Merchant Venturers, agreed to support his scheme. They had sponsored probes into the north Atlantic from the early 1480s, looking for possible trading opportunities. In 1552 Edward VI granted a royal charter to the Merchant Venturers to manage the port.
By 1670, the city had 6,000 tons of shipping, of which half was used for importing tobacco. By the late 17th century and early 18th century, this shipping was also playing a significant role in the slave trade.
Construction of the floating harbour
In the 18th century, the docks in Liverpool grew larger and so increased competition with Bristol for the tobacco trade. Coastal trade was also important, with the area called "Welsh Back" concentrating on trows with cargoes from the slate industry in Wales, stone, timber and coal. The limitations of Bristol's docks were causing problems to business, so in 1802 William Jessop proposed installing a dam and lock at Hotwells to create the harbour. The £530,000 scheme was approved by Parliament, and construction began in May 1804. The scheme included the construction of the Cumberland Basin, a large wide stretch of the harbour in Hotwells where the Quay walls and bollards have listed building status.Image:Launch-of-the-SS-GB.jpg|right|thumb|Launch of the SS Great Britain, the revolutionary ship of Isambard Kingdom Brunel, at Bristol in 1843
The tidal new cut was constructed from Netham to Hotwells, with another dam installed at this end of the harbour. The Feeder Canal between Temple Meads and Netham provided a link to the tidal river so that boats could continue upstream to Bath. However, the new scheme required a way to equalise the levels inside and outside the Dock for the passage of vessels to and from the Avon, and bridges to cross the water. Jessop built Cumberland Basin with two entrance locks from the tidal Avon, of widths, and a junction lock between the Basin and what became known as the Floating Harbour. This arrangement provided flexibility of operation with the Basin being used as a lock when there were large numbers of arrivals and sailings. The harbour was officially opened on 1 May 1809. The first vessel built in the Floating Harbour was.
Image:SS Great Britain.jpg|thumb|
Patterson's yard within the harbour was used for the construction of many ships notably Brunel's in 1838 and the in 1843. They were some of the largest ships to have been built at the time, and ironically hastened the decline of the city docks by proving the feasibility of large ships. The SS Great Britain was to be towed away from her builders, to have her 1,000 hp engines and interior fitted out on the River Thames, but her beam was too big to pass through the lock. Thus the SS Great Britain was moored in the Floating Harbour until December 1844, before proceeding into Cumberland Basin after coping stones and lock gate platforms were removed from the Junction Lock. At one time there were dozens of Bristol shipyards, the largest in the harbour being Hilhouse, who became Charles Hill & Sons in 1845.
19th century improvements
The harbour cost more than anticipated and high rates were levied to repay loans, reducing any benefit the new harbour had at drawing companies back from Liverpool. In 1848 the city council bought the docks company to force down the rates. They employed Isambard Kingdom Brunel to make improvements, including new lock gates, a dredger and sluice gates designed to reduce siltation.By the middle of the nineteenth century there was a regular steam packet passenger service to Cork, Waterford, Dublin, Tenby, Carmarthen, Haverford West, Milford Haven, Swansea, Cardiff and Newport operated by the Bristol General Steam Navigation Company from Broad Quay in St Augustine's Reach.
By 1867, ships were getting larger and the meanders in the river Avon prevented vessels over from reaching the harbour. A scheme to install a much larger lock at Avonmouth to make the entire river a floating harbour, and to straighten the sharper bends, was dropped after work began on the much cheaper docks at Avonmouth and Portishead. The present entrance lock was designed by Thomas Howard and opened in July 1873. This has a width of and is the only entrance lock now in use at the City Docks.
From 1893 until 1934 the Clifton Rocks Railway provided a funicular railway link, inside the cliff face, from the western end of the harbour, which is close to the locks, into Clifton.
Railways
The original Bristol Harbour Railway was a joint venture by the GWR and the Bristol and Exeter Railway, opened in 1872 between Temple Meads and the Floating Harbour. Its route included a tunnel under St Mary Redcliffe church and a steam-powered bascule bridge over the entrance locks at Bathurst Basin. In 1876 the railway was extended by to Wapping Wharf. In 1906, new branches from the south via the Ashton Avenue swing bridge were built to Canons Marsh on the north side of the Floating Harbour and to Wapping via a line alongside the New Cut. A Coal Concentration Depot owned by Western Fuels was established at Wapping Wharf just behind the Industrial Museum but this closed in 1987.Underfall Yard
The docks maintenance facility was established on the land exposed by the damming of the river to construct the harbour and remains sited at this location to the present day. William Jessop had created a weir in the dam at Underfall to allow surplus water to flow back into the New Cut; this was known as the 'Overfall'. By the 1830s, the Floating Harbour was suffering from severe silting. Isambard Kingdom Brunel was, however, able to devise a solution to this problem. In place of the Overfall he advised better use of three shallow sluices and one deep scouring sluice between the harbour and the New Cut, together with a dredging vessel. This drag boat would scrape the silt away from the quay walls. When the deep sluice opened at low tide, a powerful undertow sucked the silt into the river to be carried away on the next tide. The shallow sluices enabled adjustment of the dock water level according to weather conditions.Several old buildings, which date from the 1880s, remain at Underfall Yard and have listed building status. The octagonal brick and terracotta chimney of the hydraulic engine house dates from 1888, and is grade II* listed, as is the hydraulic engine house itself. It is built of red brick with a slate roof and contains pumping machinery, installed in 1907 by Fullerton, Hodgart and Barclay of Paisley, which powers the dock's hydraulic system of cranes, bridges and locks. The former pattern-maker's shop and stores date from the same period and are grade II listed, as are the Patent slip and quay walls.