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The River Lagan ( ) is a major river in Northern Irelandmarker which runs 40 miles (60 km) from the Slieve Croobmarker mountain in County Down to Belfastmarker where it enters Belfast Lough, an inlet of the Irish Seamarker. The River Lagan forms much of the border between County Antrim and County Down. It rises as a tiny fast moving stream off the Transmitter road near to the summit of Slieve Croob. From here it continues on its journey to Belfast through Dromaramarker and Dromoremarker. On the lower slopes of the mountain it is joined by another branch from Legananny (Cratlieve) Mountain, just opposite Slieve Croob. At Dromara, about four miles from its source, its height above the sea is 390 ft (119m). As the river continues on its journey to Belfast it turns east to Magheralinmarker into a broad plain between the Antrim plateau and the plateau of Down.

The river drains approximately 609 square km of agricultural land and flows over 70 km from the Mourne Mountains to the Stranmillis Weir, from which point on it is estuarine. The catchment consists mainly of enriched agricultural grassland in the upper parts, with a lower section draining urban Belfast and Lisburnmarker. There is one significant tributary, the Ravernet River, and there are several minor tributaries, including the Carryduff River, the River Farsetmarker and the Blackstaff River. Water quality is generally fair though there are localised problems and occasional pollution incidents, mainly due to effluents from farms.

The Lagan in Belfast

Lagan Weir during a falling tide
The name Belfast originates from the Irish Béal Feirste, or the mouth of the Farsetmarker, the river on which the city was built and which flows into the Lagan. Interestingly, the Farset has been superseded by the River Lagan as the most important river; the Farset now languishes under the city's High Street in obscurity.

Laganside Corporation

In 1989 the Laganside Corporation was established by the Government to redevelop the areas surrounding the Lagan in Belfast. Major developments of the Laganside Corporation along the river include the regeneration of the city's former Gasworks, the Odysseymarker entertainment and leisure development and the Lanyon Place development which includes the Waterfront Hallmarker, in many ways the flagship of the corporation.

Lagan Weir

One of the earliest and most important undertakings of the Corporation was the Lagan Weirmarker. Completed in 1994 at a cost of £14m, the weir controls the level of water upstream. One of the main functions of the weir was to put an end to the appearance of unsightly mud flats at low tide. This was mostly successful, but mud flats are still evident on the river. The weir is a series of massive steel barriers which are raised as the tide retreats so as to keep the river at an artificially constant level. This, improvements to the sewerage system and massive dredging of the river by mechanical excavators has led to a marked improvement in water quality and the environment around the river.


The river is used by a number of rowing clubs including Queen's University Boat Club, Queen's Ladies Boat Club, Methodist College Boat Clubmarker, Royal Belfast Academical Institution (RBAI) Rowing Club, Belfast Rowing Club (BRC) and Lagan Scullers Club ([84806]). The Boathouses are all based between the Governors Bridge and the Stranmillis Weir.

The Lagan in Lisburn

In a similar way to the regeneration of Belfast riverside Lisburn City Council has embarked on a series of developments around the River Lagan. The centre-piece of this strategy has been the Lagan Valley Island complex; a new headquarters for the council and an Arts Centre, wedding and conference facilities and a restaurant. Opened in 2001 the building is surrounded by the Lagan on one side and a channel linked to the river on the other.

The Lagan Navigation

The old Lagan Canal (disused) at Broadwater, near Aghalee (The disused canal is not part of River Lagan, part of The Lagan River was another part of this canal.)
In the late 1800s a canal was built from Lough Neaghmarker to Belfast, using some of the river as a navigable waterway and diverting water from other areas to supply separate canal sections. However by the mid twentieth century the route had fallen into disuse and was largely derelict. The M1 motorway was built across the route. Currently, the section of the navigation's towpath running from Lisburnmarker to almost the centre of Belfastmarker has been restored.


Atlantic salmon became extinct in the River Lagan, which enters the Irish Seamarker through the port of Belfast, between 1750 and 1800, coinciding with a period of major population growth, industrialisation and the construction of a navigable waterway based on the river. The latest record of a salmon population in the river dates from 1744. From 1950 to 1990, water quality in the river improved as a result of improved sewage treatment, the Lagan Navigation was abandoned and fell into disuse, and many industrial effluents were diverted to sewer. A fish survey in the early 1970s found no fish at all in the urban reach of river through Belfast. Brown trout and several other species remained present in the upper reaches of the river throughout the worst of the downstream urban problems. The 1980s saw some recreational angling for non-migratory fish developing in the Belfast reaches of the river, and there were very occasional reports of migratory salmon or sea trout being seen in the river. In 1991, the first of a series of stockings took place and the first adult salmon returned to the Lagan in 1993.

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