The River Thames is the second-longest river in the United Kingdom, passes through the capital city, and has many crossings.

Counting every channel – such as by its islands linked to only one bank – it is crossed by over 300 bridges. If taking cuts – excavated channels – to be measurements of river, its 185-mile (298 km) course west of Tilbury has 27 tunnels, six public ferries, one cable car link, and one ford. From end to end a channel of the Thames can be seen, mostly its main flow, which is passed over by 138 bridges. These are listed here with 2 former bridges and a seasonal festival bridge. Over 162 other bridges link to such places as typical or man-made islands or across an array of corollary and lesser side channels (backwaters), particularly in and around Oxford and the non-village channel of Ashton Keynes — these are not listed.

The river's lower estuary is shallow – but wide – and has no crossing east of Tilbury, the easternmost half as most broadly defined which even extends to the end of the rivers Medway and Crouch.

Until sufficient crossings were established, the river provided a formidable barrier for most of its course – in post-Roman Britain during the Dark Ages Belgic-Celtic tribal lands and Anglo-Saxon kingdoms and subdivisions were defined by which side of the river they were on. In the latter's system of English counties continued by predominantly Norman England and for some centuries thereafter, the river formed a mutual limit of counties. After rising in Gloucestershire, the river flows between, on the north bank, the historic counties of Oxfordshire, Buckinghamshire, Middlesex and Essex; and on the south bank, the counties of Wiltshire, Berkshire, Surrey, and Kent. However the many permanent crossings that have been built over the centuries have changed the dynamics and made cross-river development and shared responsibilities more practicable.

In 1911 Caversham, on the north bank, was transferred into Berkshire. In 1965, with the creation of Greater London, the London Borough of Richmond upon Thames united areas formerly in Middlesex and Surrey; and at the same time two urban districts in Middlesex (united in 1974) became part of Surrey. Further changes in 1974 moved some of the boundaries away from the river. For example, much of the north west of Berkshire including Wallingford, Abingdon and Wantage became part of Oxfordshire, and some southern parts of Buckinghamshire became part of Berkshire, including Slough, Eton and Wraysbury. The number of county councils has fallen (and some others have dwindled in area) in England in favour of increased localisation.^{[note 1]}

Lessening these last changes, in the sports of rowing and skiffing the river banks are referred to by their traditional county names, and in football and cricket the traditional counties also, often, persist.^{[note 2]}

The original crossings over the Thames would all have been fords- typically on gravel beds. Well known ones include Wallingford and Oxford, but it is likely that there was a prehistoric ford where the Romans built London Bridge. In the upper reaches of the Thames, the river depth was raised by dams and in the lower reaches it was raised by embankments, so gradually most fords were lost.^[1] At least one regular ford remains, at Duxford.

Many of the present road bridges over the river are on the sites of earlier fords, ferries and wooden structures. The earliest known major crossings of the Thames by the Romans were at London Bridge and Staines Bridge. At Folly Bridge in Oxford the remains of the Saxon forerunner can be seen, and medieval stone ones such as Wallingford, Newbridge in west Oxfordshire and Abingdon Bridges are still in use. In today's south-west London lies Kingston Bridge, which was the only crossing between London Bridge and Staines until the beginning of the 18th century and has been twice widened since its completion.

Proposals to build bridges for Lambeth/Westminster and Putney/Fulham in around 1670 were defeated by the Rulers of the Company of Watermen, since it would cut the trade of the then 60,000 rivermen plying ferry services and who were noted as a pool of naval reserves.^[2]

During the 18th century, many stone and brick instances were built – from new or to replace existing structures – in London and further up the river. These included Westminster, Putney, Datchet, Windsor and Sonning Bridges. Several central London road bridges were built in the 19th century, most conspicuously Tower Bridge, the only bascule bridge on the river, which enables some types of ocean-going ships to pass beneath it. The most recent road bridge sites are the bypasses at Isis Bridge and Marlow By-pass Bridge and for motorways such as the two for the M25: Queen Elizabeth II Bridge and M25 Runnymede Bridge.

The development of the railways resulted in a spate of bridge building in the 19th century, including Blackfriars and Charing Cross (Hungerford) Railway Bridges in central London, and the simple but majestic three, of grand arch design, by Isambard Kingdom Brunel at Maidenhead, Gatehampton and Moulsford.

The world's first underwater tunnel was the Thames Tunnel by Marc Brunel built in 1843, designed for horse-drawn carriages but used as a pedestrian route; since 1869 the tunnel has carried trains on the East London Line. The Tower Subway (1870) was briefly used for a railway; later came all the deep-level tube lines. Two road tunnels were built in East London at the end of the 19th century, the Blackwall Tunnel and the Rotherhithe Tunnel; and the latest tunnel is the Dartford Crossing.

Many footbridges were made across the weirs that were built on the non-tidal river, and some of these remained when the locks were built, such as at Benson Lock. Some, above Oxford, have survived when the weir was lost, as at Hart's Weir Footbridge. Around the year 2000 several were added, as part of the Thames Path or for the Millennium. These include Temple, Bloomers Hole, the Hungerford Footbridges and the Millennium Bridge in distinct, aesthetic but durable, forms.

Six ferries cross the river:

• The Woolwich Ferry is one of two in the Thames Gateway, linking the North and South Circular roads. The Gravesend–Tilbury Ferry further downstream is a pedestrian ferry only.
• Upstream of central London, the Hammertons Ferry is a passenger link between the tourist attractions of Ham House and Marble Hill House in Twickenham.^[3]
• Further upstream, the Hampton Ferry, the Sunbury Ferry, and the Shepperton to Weybridge Ferry are all pedestrian ferries to the west of London.^[4]

The list is from the estuary to the source. A few of the crossings listed are public foot bridges using walkways across lock gates and then bridges parallel to or on top of the associated weir(s) to the non-lock-associated bank. Most of the other locks on the River Thames also have walkways across their lock gates and/or weirs, but these do not completely cross the river, or are restricted to authorised personnel only, and are therefore not listed.

Also operating are boat services, ranging from year-round in London to seven or fewer months (including the summer) serving upper stretches. Whilst their main purpose is not to carry people across the river, several bring about one or more crossings but usually not to points facing each other.

Not all of the bridges above Cricklade are listed below. For example, there are a number of small agricultural bridges allowing access between fields, and bridges to properties in Ashton Keynes that are not mentioned.

More information Crossing, Type ...

Crossing	Type	Co-ordinates	Date opened	Notes	Photo
Aqueduct footings footbridge	Footbridge, navigable aqueduct	51°39′5″N 1°52′31″W		Site of a former aqueduct carrying the North Wilts Canal over the Thames.
Midland and South Western Junction Railway bridge	Railway bridge, footbridge	51°39′4″N 1°52′55″W		Formerly a bridge for the Midland and South Western Junction Railway.
Stones Lane footbridge	Footbridge	51°38′57″N 1°53′11″W		Footbridge at Hailstone House.
Manor Farm bridge	Road bridge	51°38′23″N 1°54′14″W		North of Manor Farm, Waterhay.
Brook Farm bridge	Road bridge	51°38′22″N 1°54′28″W		North of Brook Farm, Waterhay.
Waterhay bridge	Road bridge	51°38′17″N 1°54′53″W
Unnamed footbridge	Footbridge	51°38′20″N 1°55′25″W		The footbridge and a ford carry a bridlepath over the river, just outside Ashton Keynes.
Bridge on High Road	Road bridge	51°38′25″N 1°55′51″W		Bridge on High Road, Ashton Keynes
Bridge on The Derry	Road bridge	51°38′30″N 1°55′56″W		Bridge on The Derry, Ashton Keynes
Bridge on Gosditch, Ashton Keynes	Road bridge	51°38′42″N 1°56′7″W
Bridge on Church Walk, Ashton Keynes	Road bridge	51°38′48″N 1°56′10″W
Bridge on Church Lane, Ashton Keynes	Road bridge	51°38′48″N 1°56′14″W
Bridge on B4696, Ashton Keynes	Road bridge	51°38′46″N 1°56′31″W
Bridges	Road bridge and pedestrian bridge	51°38′46″N 1°56′56″W
Bridge	Road bridge	51°38′43″N 1°57′38″W
Footbridge	Pedestrian bridge	51°38′48″N 1°57′46″W
Bridge	Road bridge	51°38′51″N 1°57′58″W
Bridge	Road bridge	51°38′52″N 1°58′2″W
Bridge	Road bridge	51°38′54″N 1°58′8″W
Footbridge	Pedestrian bridge	51°38′59″N 1°58′17″W
Bridge	Road bridge	51°39′2″N 1°58′24″W
Neigh Bridge	Road bridge	51°39′6″N 1°58′29″W
Bridge south of Ewen	Road bridge	51°40′27″N 1°59′44″W
Parker's Bridge, Ewen	Road bridge	51°40′31″N 2°0′25″W
A429 Road Bridge	Road bridge	51°40′47″N 2°0′53″W		Demolished bridge on the currently closed Cirencester Branch Line ran over the road. Part of the Beeching Axe legacy.
A433 Road Bridge, Fosse Way Roman Road	Road bridge	51°41′24″N 2°1′21″W		At Thames Head

Close

The river splits as it passes through Ashton Keynes. An alternative route to that listed above crosses High Bridge at 51°38′13″N 1°55′46″W and Three Bridges at 51°38′18″N 1°56′21″W.

• Islands in the River Thames
• Locks and weirs on the River Thames
• List of bridges in London
• London River Services
• Thames Path
• Tunnels underneath the River Thames