Trade and Industry
From earliest times, the Dee estuary was a major trading and military route, to and from Chester. From about the 14th century, Chester provided facilities for trade with Ireland, Spain, and Germany, and seagoing vessels would "lay to" in the Dee awaiting favourable winds and tides. As the Dee started to silt up, harbouring facilities developed on the Wirral bank at Shotwick, Burton, Neston, Parkgate, Dawpool, and "Hoyle Lake" or Hoylake. The excavation of the New Cut in 1737, to improve access to Chester, diverted the river's course to the Welsh side of the estuary, but failed to stem the silting up of the river, and Chester's trading function declined as that of Liverpool on the River Mersey grew. However, Chester was still a major port of passenger embarkation for Ireland until the early 19th century.
The Dee Estuary was industrialised from quite early on the industrial revolution and some industry remains today. Notable amongst these are the gas fired power station at Connah's Quay, three separate paper mills and a chemical manufacturing plant, and numerous smaller manufacturing industries. The estuary also receives the treated sewage effluent from Queensferry works and from Chester sewage treatment works. At the mouth of the estuary is the natural gas sweetening plant at Point of Ayr on the site of the former colliery. There are also commercial docks at Mostyn although their use is limited by the tide.
Signs of past industry are visible along the whole length of the estuary especially on the Welsh side. Large stretches of what now appear as flood embankments are long abandoned industrial waste heaps, some still containing highly reactive and caustic materials, including large heaps of Galligu, a by-product of the LeBlanc process used at the James Muspratt alkali works at Flint.
The Dee estuary also supported industries concerned with the synthesis of PCBs and some pharmaceuticals and was also home to several industrial waste oil reclamation industries.
As a consequence of its industrial heritage, there are extensive areas of contaminated ground along the shores of the estuary.
The estuary also plays a part in the most modern of industries as it provides the first stage of transport of Airbus A380 wings on their way to Toulouse via barge to Mostyn docks.
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