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The River Tees (), in England, rises on the eastern slope of Cross Fell in the North Pennines and flows eastwards for to reach the North Sea in the North East of England. "BBC Where I Live" – BBC. Retrieved 2 March 2007. The modern-day history of the river has been tied with the industries on Teesside in its lower reaches, where it has provided the means of import and export of goods to and from the North East England. The need for water further downstream also meant that reservoirs were built in the extreme upper reaches, such as Cow Green.
*Teihx-s, a root possibly derived from Brittonic *ti (Welsh tail, "dung, manure"), has also been used to explain the name Tees (compare River Tyne).
The source of the river at Teeshead just below Cross Fell is at an elevation of about . It flows east-north-east through an area of shake holes through Limestone. Below Viewing Hill, it turns south to the Cow Green Reservoir constructed to store water to be released in dry conditions to satisfy the industrial need for water on Teesside. Tees at Barnard Castle in Dales Area – Artificial influences
Emerging from the reservoir at Cauldron Snout the river traverses a series of hard black basalt and dolerite rocks that intrude through the softer limestone, in a succession of falls or rapids. From this point downstream the Tees forms the boundary between the traditional counties of Durham and Yorkshire almost without a break, although since 1974 much of it is wholly in Durham. The dale widens below Cauldron Snout, and trees appear, contrasting with the broken rocks where the water descends over High Force. After a short turn northwards, the river continues to meander south-easterly. Close to where the B6277 road begins to run parallel to the river is the High Force waterfall. About downstream is the smaller Low Force waterfall.
The scenery becomes gentler and more picturesque as the river descends past Middleton-in-Teesdale (Durham). This locality has lead and ironstone resources. Just to the east of Middleton-in-Teesdale, the River Lune joins the Tees. After passing the village of Romaldkirk to the west, the river is joined by the River Balder at Cotherstone. The ancient town of Barnard Castle, Egglestone Abbey, and Rokeby Park, known through Sir Walter Scott's poem Rokeby, are all passed. At Rokeby the Tees is joined by the River Greta. From the area near Eggleston, the river is crossing over millstone grit. From here the valley begins to open out, and traverses the rich plain east and south of Darlington in large meandering curves.
The course of the valley down to here has been generally east-south-east, but it now turns north-east near the village of Whorlton. Passing Ovington and Winston it runs parallel to the A67 south-east past Gainford and Piercebridge to Darlington, passing under the A1 and A66. The section from Piercebridge to Hurworth flows over magnesian limestone. It is at Croft-on-Tees that the River Skerne joins the Tees. The river now flows south past Croft-on-Tees before swinging northwards past Hurworth-on-Tees. A series of large meanders takes the course past Neasham, Low Dinsdale and Sockburn to Middleton St George. In the lower reaches of the river valley the water flows over bunter sandstone and Gravel.
Just past Yarm, the River Leven joins the Tees, before passing the settlements of Eaglescliffe, Ingleby Barwick and Thornaby-on-Tees. Now nearing the sea, the Tees becomes an important commercial waterway, with the ports of Stockton-on-Tees and Middlesbrough on its banks. It passes through the Tees Barrage between these ports, turning tidal downstream from the barrage.
Teesport is built on reclaimed land on the south side of the Tees estuary below Middlesbrough. A direct line from the source of the Tees to Teesmouth is , but due to the meandering of the river, it flows for over .
| Middleton-on-Tees | ||||
| Barnard Castle (Startforth) | ||||
| Broken Scar (Darlington) | ||||
| Low Moor (Low Dinsdale) | ||||
| Yarm |
Since the cuts were made, the river has continued to undergo alterations to its bed and banks to make it deeper and more navigable. The channel has been made considerably narrower by dumping ship's ballast and ironworks slag along the former banks, increasing the scouring due to its natural flow. Maps made prior to 1900The History of the River Tees in Maps, 3rd. Ed. (2001), D. W. Pattenden, published by Cleveland and Teesside Local History Society show that between Stockton and Middlesbrough the river flowed in a channel up to wide in places, with many shoals and sandbars. The modern channel varies between about and .
In October 2021 the UK engineering company, GRAHAM, started work on the South Bank Quay project to provide a deep water facility. It is expected that two million tonnes of material will be dredged to allow GE Renewable Energy to load huge wind turbine blades onto ships. The long blades are destined for the Dogger Bank wind farm. The Heavy Fuel Oil Farm and Tarmac jetties are to be removed.
The move to loading coal on bigger ships in Middlesbrough was the economic driver for the development not only of the town of Middlesbrough itself but also of the railway between Stockton and Darlington. This is where George Stephenson developed his railway engine "Locomotion" and this railway was the first steam railway to carry passengers, as well as industrial materials. The Stockton and Darlington Railway was founded after an initial shareholders' meeting in a room in a public house in Yarm.
Today Teesport is owned by PD Ports; it is located close to the North Sea and east of Middlesbrough. Teesport is currently the third largest port in the United Kingdom, and among the ten biggest in Western Europe, handling over 56 million tonnes of domestic and international cargo per year. The vast majority of these products are still related to the steel and chemical industries made by companies that are members of the Northeast of England Process Industry Cluster (NEPIC). The areas where large scale commodity chemical industry continues to be based are Billingham and Seal Sands, both on the north bank of the River Tees, and Wilton on the south bank. The Teesside Steelworks at Redcar operated until closure in 2015.
Other industrial companies that use the River Tees are manufacturing and servicing the North Sea oil and gas industry as well as the renewable energy industry sector, including offshore wind turbines. The south bank of the mouth of the River Tees has the 62-megawatt Teesside Offshore Wind Farm, built 2011–13.
Near the mouth of the River Tees is the large dry dock facility of ABLE UK, named TERRC (Teesside Environmental Reclamation and Recycling Centre), used to dismantle or oil rigs and other large vessels. Hartlepool Nuclear Power Station is adjacent to the east.
By late November the crustacean die-off had spread as far south as Robin Hood's Bay and was affecting catches in Whitby. The Environment Agency has ruled out chemical pollution as the cause of the mass shellfish deaths. Dredging was also rejected as the cause of the environmental disaster. Environment Agency operations manager Sarah Jennings said, "We've used both traditional and innovative screening methods to analyse samples of water, sediment and crab looking for traces of contamination. We’ve screened for over 1,000 potential chemical contaminants but found no anomalies that could lead to an event of this scale."
In early February 2022 it was reported that, "Defra and partner agencies have completed a thorough investigation of the cause of dead crabs and lobsters which were found washed up on the North East coast between October and December 2021. Following significant testing and modelling to rule out possible causes, Defra and partner agencies consider that the deaths of the crabs and lobsters potentially resulted from a naturally occurring harmful algal bloom." In June 2022 George Monbiot wrote in The Guardian, "Astonishingly, although there is no evidence that it conducted such sampling, the government concluded not only that a bloom had occurred, but that it was caused by a particular, toxic species: Karenia mikimotoi. This is the stuff of science fiction. Karenia thrives in temperatures between . The average water temperature on this coast in October is . There is no plausible mechanism by which a Karenia bloom could cause the mass death of lobsters and crabs without also killing large numbers of fish, sea urchins and many other species." Monbiot reported that when he asked the UK government to publish its evidence the government refused.
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