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The River Ogmore ( cy, Afon Ogwr) is a
river A river is a natural flowing watercourse, usually freshwater, flowing towards an ocean, sea, lake or another river. In some cases, a river flows into the ground and becomes dry at the end of its course without reaching another body of wate ...
in
South Wales South Wales ( cy, De Cymru) is a 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 Glamorgan and Monmouthshire, south Wales extends westwards ...
that is popular with anglers. It runs generally from north to south from the Ogmore Vale and Gilfach Goch, past
Bridgend Bridgend (; cy, Pen-y-bont ar Ogwr or just , meaning "the end of the bridge on the Ogmore") is a town in Bridgend County Borough in Wales, west of Cardiff and east of Swansea. The town is named after the Old Bridge, Bridgend, medieval bridge ...
and Ogmore. The River Ogmore rises at Craig Ogwr (527 m) in the
Ogmore Valley Ogmore Valley ( cy, Cwm Ogwr) is a community in the Bridgend County Borough, Mid Glamorgan, Wales. Made up of the villages of Nantymoel, Ogmore Vale, Price Town and Wyndham, its population at the time of the 2001 census was 7,800, increasing to ...
as the Ogwr Fawr before it links with the Ogwr Fach at
Blackmill Blackmill is a small village within Bridgend County Borough Council, in south Wales. It is located at the confluence of the Ogwr Fach and Ogmore rivers, to the north-east of Bridgend town. It is sited within the community (parish) of Ogmore Va ...
. The River Llynfi, the River Garw and finally the River Ewenny in its
estuary An estuary is a partially enclosed coastal body of brackish water with one or more rivers or streams flowing into it, and with a free connection to the open sea. Estuaries form a transition zone between river environments and maritime environment ...
are all
tributaries A tributary, or affluent, is a stream or river that flows into a larger stream or main stem (or parent) river or a lake. A tributary does not flow directly into a sea or ocean. Tributaries and the main stem river drain the surrounding drainage b ...
of the Ogmore which flows into the sea between
Ogmore-by-Sea Ogmore-by-Sea ( Welsh: ''Aberogwr'', meaning "Mouth of the River Ogmore") is a seaside village in St Brides Major community in the Vale of Glamorgan, Wales. It lies on the western limit of the Glamorgan Heritage Coast of south Wales. The pop ...
and the
Merthyr Mawr Merthyr Mawr is a village and community in Bridgend, Wales. The village is about 2½ miles from the centre of Bridgend town. The population of the community at the 2011 census was 267. The community occupies the area west of the Ewenny River, be ...
sand-dunes.


Geology and geography

The Ogmore has two major branches in its headwaters: the which flows south through
Nantymoel Nant-y-moel or Nantymoel (meaning "stream from the bare mountain") is a village and includes the formerly separate village of Pricetown in the county borough of Bridgend, Wales on the River Ogmore, and is one of the constituent villages of the ...
,
Ogmore Vale Ogmore Vale ( cy, Cwm Ogwr) is a village (and electoral ward) in the county borough of Bridgend, Wales on the River Ogmore. The village's main source of income came from coal mining. Up until the year 1865, the Ogmore valley was a quiet, isolate ...
and Lewistown; and joining it from the east the which flows through . After the confluence with the , they join to form the at
Blackmill Blackmill is a small village within Bridgend County Borough Council, in south Wales. It is located at the confluence of the Ogwr Fach and Ogmore rivers, to the north-east of Bridgend town. It is sited within the community (parish) of Ogmore Va ...
. Most of the headwaters flow over
Carboniferous The Carboniferous ( ) is a geologic period and system of the Paleozoic that spans 60 million years from the end of the Devonian Period million years ago ( Mya), to the beginning of the Permian Period, million years ago. The name ''Carbonifero ...
coal Coal is a combustible black or brownish-black sedimentary rock, formed as rock strata called coal seams. Coal is mostly carbon with variable amounts of other elements, chiefly hydrogen, sulfur, oxygen, and nitrogen. Coal is formed when dea ...
measures overlain by
glacial drift In geology, drift is a name for all sediment (clay, silt, sand, gravel, boulders) transported by a glacier and deposited directly by or from the ice, or by glacial meltwater. Drift is often subdivided into (unsorted and) unstratified drift (glaci ...
and
fluvial In geography and geology, fluvial processes are associated with rivers and streams and the deposits and landforms created by them. When the stream or rivers are associated with glaciers, ice sheets, or ice caps, the term glaciofluvial or fluviog ...
gravel Gravel is a loose aggregation of rock fragments. Gravel occurs naturally throughout the world as a result of sedimentary and erosive geologic processes; it is also produced in large quantities commercially as crushed stone. Gravel is classifi ...
s. The valleys are reasonably broad for a small river, and many of the tributaries meandered through their valleys in the past. The considerable urbanisation, especially in the 19th century, confined most rivers to rather narrow artificial channels, bordered in places such as
Bridgend Bridgend (; cy, Pen-y-bont ar Ogwr or just , meaning "the end of the bridge on the Ogmore") is a town in Bridgend County Borough in Wales, west of Cardiff and east of Swansea. The town is named after the Old Bridge, Bridgend, medieval bridge ...
with concrete flood protection walls.


Major tributaries


River Llynfi

The
River Llynfi The River Llynfi, cy, Afon Llynfi, is one of three main tributaries of the River Ogmore ( cy, Afon Ogwr). It runs for around 10 miles from its source north of Maesteg and flows generally southwards through the Llynfi Valley to the confluence w ...
( cy, Afon Llynfi), runs for around 10 miles from its source north of
Maesteg Maesteg is a town and community in Bridgend County Borough, Wales. Maesteg lies at the northernmost end of the Llynfi Valley, close to the border with Neath Port Talbot. In 2011, Maesteg had a population of 20,612. The English translation of Mae ...
and flows generally southwards through the Llynfi Valley to the
confluence In geography, a confluence (also: ''conflux'') occurs where two or more flowing bodies of water join to form a single channel. A confluence can occur in several configurations: at the point where a tributary joins a larger river (main stem); o ...
with the River Ogmore at
Aberkenfig Aberkenfig ( cy, Abercynffig, meaning "mouth of the Kenfig" (stream)) is a village located in the Bridgend (county borough), County Borough of Bridgend, Wales to the north of Bridgend town. It is in the Community (Wales), community of Newcastle H ...
.


River Garw

The River Garw flows broadly north-south and runs through
Pontycymer Pontycymer, also spelt Pontycymmer, is a former mining village in Wales. It is situated in the Garw Valley, in Bridgend County Borough, about 7 miles or 11 km north of the town of Bridgend. It‘s attractions include a small Heritage rail ...
to its confluence with the Ogmore (Ogwr) at
Brynmenyn Brynmenyn is a small village located at the confluence of the Garw and Ogmore rivers in south Wales, around 4 miles north of Bridgend, and it also in the Bridgend County Borough council area. The village has its own primary school. Transport T ...
.


River Ewenny

The
Ewenny River The Ewenny River ( cy, Afon Ewenni) is a river in South Wales. For most of its length, it forms the border between the Vale of Glamorgan and Bridgend. It is a major tributary of the River Ogmore, which it joins near its estuary. Course The riv ...
( cy, Afon Ewenni) rises to the north-east of
Bridgend Bridgend (; cy, Pen-y-bont ar Ogwr or just , meaning "the end of the bridge on the Ogmore") is a town in Bridgend County Borough in Wales, west of Cardiff and east of Swansea. The town is named after the Old Bridge, Bridgend, medieval bridge ...
town and flows through
Pencoed Pencoed ( cy, Pen-coed) is a urbanised community and town in the county borough of Bridgend, Wales. It straddles the M4 motorway north east of Bridgend and is situated on the Ewenny River. At the 2011 census it had a population of around 9,166. ...
and Coychurch before entering the River Ogmore
estuary An estuary is a partially enclosed coastal body of brackish water with one or more rivers or streams flowing into it, and with a free connection to the open sea. Estuaries form a transition zone between river environments and maritime environment ...
just below
Ogmore Castle Ogmore Castle ( cy, Castell Ogwr) is a Grade I listed castle ruin located near the village of Ogmore-by-Sea, south of the town of Bridgend in Glamorgan, South Wales. It is situated on the south bank of the River Ewenny and the east bank of the Riv ...
.


Environment

The industrialisation of the valley of the Ogmore by mining and heavy industry severely damaged much of the natural environment of the river. However, there has been an improvement in recent years and it supports a healthy population of aquatic invertebrates. The river does still have some problems though, including its proximity to major industrial plants, insensitive development and invasive weeds.


Estuary

Until some years ago, the adjacent sewage works discharged effluents into the estuary, but the water outlets have since been treated with ultraviolet light and do not flow frequently into the river. However, in periods of heavy rain, emergency outfalls pour into the river, releasing some sewage.


Fishery

In its industrial heyday, the Ogmore had no salmonid fish along much of its length, although brown trout survived in many of the smaller tributaries. From the 1980s onwards,
salmon Salmon () is the common name for several list of commercially important fish species, commercially important species of euryhaline ray-finned fish from the family (biology), family Salmonidae, which are native to tributary, tributaries of the ...
and sea-trout started returning to the main river and the River Garw in ever-increasing numbers, but continued to avoid the chronically polluted Llynfi. However, even on the Llynfi, native brown trout numbers increased upstream of Tondu, and these were occasionally supplemented by stocked
rainbow trout The rainbow trout (''Oncorhynchus mykiss'') is a species of trout native to cold-water tributaries of the Pacific Ocean in Asia and North America. The steelhead (sometimes called "steelhead trout") is an anadromous (sea-run) form of the coasta ...
. In all parts of the river, trout can now be found, with salmon and sea trout almost everywhere. In addition
eel Eels are ray-finned fish belonging to the order Anguilliformes (), which consists of eight suborders, 19 families, 111 genera, and about 800 species. Eels undergo considerable development from the early larval stage to the eventual adult stage ...
s remain common, and millers thumb,
gudgeon A gudgeon is a socket-like, cylindrical (i.e., ''female'') fitting attached to one component to enable a pivoting or hinging connection to a second component. The second component carries a pintle fitting, the male counterpart to the gudgeon, ...
,
stone loach The stone loach (''Barbatula barbatula'') is a European species of fresh water ray-finned fish in the family Nemacheilidae. It is one of nineteen species in the genus ''Barbatula''. Stone loaches live amongst the gravel and stones of fast flowin ...
and
minnow Minnow is the common name for a number of species of small freshwater fish, belonging to several genera of the families Cyprinidae and Leuciscidae. They are also known in Ireland as pinkeens. Smaller fish in the subfamily Leusciscidae are co ...
are found throughout.


References


External links


www.geograph.co.uk : photos of the River Ogmorewww.geograph.co.uk : photos of the River Ewenny and surrounding area
{{DEFAULTSORT:Ogmore Rivers of Bridgend County Borough Rivers of the Vale of Glamorgan