The River Trym is a short river, some in length, which rises in Filton,

South Gloucestershire South Gloucestershire is a unitary authority area in the ceremonial county of Gloucestershire, South West England. Towns in the area include Yate, Chipping Sodbury, Kingswood, Thornbury, Filton, Patchway and Bradley Stoke. The southern p ...

England England is a Countries of the United Kingdom, country that is part of the United Kingdom. It is located on the island of Great Britain, of which it covers about 62%, and List of islands of England, more than 100 smaller adjacent islands. It ...

. The upper reaches are

culvert A culvert is a structure that channels water past an obstacle or to a subterranean waterway. Typically embedded so as to be surrounded by soil, a culvert may be made from a pipe (fluid conveyance), pipe, reinforced concrete or other materia ...

ed, some underground, through mostly urban landscapes, but once it emerges into the open it flows through a nature reserve and city parks before joining the tidal River Avon at Sea Mills. A medieval water mill near its mouth gave the area its name. ''Abona'' was a Roman port at the mouth of the Trym which provided an embarkation point for journeys across the

River Severn The River Severn (, ), at long, is the longest river in Great Britain. It is also the river with the most voluminous flow of water by far in all of England and Wales, with an average flow rate of at Apperley, Gloucestershire. It rises in t ...

south Wales South Wales ( ) is a Regions of Wales, loosely defined region of Wales bordered by England to the east and mid Wales to the north. Generally considered to include the Historic counties of Wales, historic counties of Glamorgan and Monmouthshire ( ...

. In the 18th century there were short lived attempts at creating a port and a whale fishery here. The name Trym appears to have

Anglo-Saxon The Anglo-Saxons, in some contexts simply called Saxons or the English, were a Cultural identity, cultural group who spoke Old English and inhabited much of what is now England and south-eastern Scotland in the Early Middle Ages. They traced t ...

roots. In recent years silting problems, caused by urban development, have caused some difficulties, but alleviation works have helped reduce the problem.

Course

The Trym rises near Filton in South Gloucestershire, in the area of Filton Golf Club, and much of its upper course is culverted underneath 20th century housing. It surfaces in the Bristol suburb of Southmead, then flows open through Badock's Wood

nature reserve A nature reserve (also known as a wildlife refuge, wildlife sanctuary, biosphere reserve or bioreserve, natural or nature preserve, or nature conservation area) is a protected area of importance for flora, fauna, funga, or features of geologic ...

. Just south of here is

Henleaze Henleaze is a suburb in the north of the city of Bristol in South West England. It is an almost entirely residential interwar development, with Edwardian streets on its southern fringes. Its main neighbours are Westbury on Trym, Horfield, ...

Swimming Lake, a former quarry fed by springs, the overflow running into the Trym. The river is culverted through Westbury-on-Trym village. A sluice here is used to divert water into a storm drain in times of high rainfall to save the village centre from flooding. The Trym then disappears into culverts, re-emerging at Henbury Golf Club before entering the Blaise Castle estate, where it is joined on the right bank by the

Hazel Brook The Hazel Brook, also known as the Hen, is a tributary of the River Trym in Bristol, England. It rises at Cribbs Causeway in South Gloucestershire. From there, its course takes it south, passing the western end of Filton Aerodrome on its lef ...

above Coombe Dingle. The remains of Coombe Mill, which was fed by both the Hazel Brook and the Trym, can be seen here. Passing under Dingle Road bridge, the river then flows through Sea Mills river park, passing under the Portway and the Severn Beach railway line before joining the river Avon. A weir under the Portway prevents flooding upstream, except during the highest

spring tide Tides are the rise and fall of sea levels caused by the combined effects of the gravitational forces exerted by the Moon (and to a much lesser extent, the Sun) and are also caused by the Earth and Moon orbiting one another. Tide tables ...

Natural history

Badock's Wood in Southmead is a nature reserve managed by Bristol City Council. Areas of beech, oak and ash woodland support a range of other bushes and shrubs, including hazel, maple, hawthorn and blackthorn. Badock's Meadow, a former prefab housing estate, has been reseeded with native meadow plants including oxeye daisies, yellow rattle, wild carrot and knapweed. Wildlife includes native woodland birds including woodpeckers and owls, also pipistrelle bats. The Blaise Castle estate contains a variety of trees and plant life, also providing cover for birds and small mammals. Further downstream, just above Sea Mills, Himalayan Balsam and Japanese Knotweed, both invasive riverside plants, have established themselves. Ducks and moorhen can be found along many stretches of the river, with gulls and estuary birds near the mouth. A pollution incident by Wessex Water which allowed sewage to flow into the Trym in 2001, killing eels, sticklebacks and invertebrates, resulted in a fine following prosecution by the

Environment Agency The Environment Agency (EA) is a non-departmental public body, established in 1996 and sponsored by the United Kingdom government's Department for Environment, Food and Rural Affairs, with responsibilities relating to the protection and enha ...

. Other pollution incidents have followed.

History

At the confluence of the Trym with the Avon was the Roman port and small town of ''Abona'', which took its name from the main river Avon, which simply means 'river' in British Celtic. Abona was a staging point for the Roman invasion of

Wales Wales ( ) is a Countries of the United Kingdom, country that is part of the United Kingdom. It is bordered by the Irish Sea to the north and west, England to the England–Wales border, east, the Bristol Channel to the south, and the Celtic ...

and was at the western end of the Roman road from Silchester. By the 15th century there was a water mill just above the tidal limit of the Trym. In later centuries there were also two water mills in Coombe Dingle: Clack Mill (also known as Black Mill) beside what is now the bend in Coombe Bridge Avenue, and Coombe Mill where the Hazel Brook joins the Trym. An attempt was made in 1712 by the entrepreneur Joshua Franklyn to open a commercial dock at the mouth of the Trym, on the Roman site, but the venture foundered after a few decades. A whale fishery enterprise set up in 1752 was equally short lived. Parts of the dock walls can still be seen.

Etymology

Linguistics sources indicate that the name ''Trym'' may derive from the Anglo-Saxon, meaning 'firm' or 'strong' one'.

Hydrology

The flow of the river has decreased in power in recent years, partly because of surface run-off in the upper catchment of the Hazel Brook, especially from the large retail centre at

Cribbs Causeway Cribbs Causeway is both a road in South Gloucestershire, England, running north of the city of Bristol, and the adjacent area which is notable for its Out-of-town shopping centres in the United Kingdom, out-of-town shopping and leisure facilitie ...

. The run-off sends a good deal of silt into the system, slowing the flow and creating a risk of flooding downstream. This problem has now been partially alleviated by the construction of the Catbrain attenuation reservoir near Cribbs Causeway. Measurements of pollution by the city council show the water to be relatively clean.

Course

Natural history

History

Etymology

Hydrology

Notes

Further reading