Plaid Loch (NS 485186) was a freshwater loch in East Ayrshire, now a remnant due to drainage, near Sinclairston and 2 miles (3 km) south-east of Drongan, lying in a glacial kettle hole,.Love, Page 197
Molls map of 1745 shows a single loch that could be either Belston or Plaid. Moll's Map Retrieved : 2011-11-19 Roy's map of 1747 does not record the loch position, however a Laigh Plaid and High Plaid are marked. Roy's Map retrieved : 2011-11-19 Armstrong's map of 1775 shows a substantial elongated loch with a Belston and a Drumsmiden nearby and an inflow from the north coming from the vicinity of Rattenraw (Rottenrow). Armstrong's Map Retrieved : 2011-11-19 In 1821 a rounded loch is clearly shown, fed by burns from Ochiltree and Glenconnor. Ainslie Retrieved : 2011-11-19 In 1832 Thomson's map shows a rounded 'Plaid' with substantial surrounding marshlands; Laigh and High Plaid are recorded. Thomson's Map Retrieved : 2011-11-19
In 1880 the loch was situated amongst extensive marshland and scrub with an outflow passing the Rottenrow area into the Burnock Water and running eventually into the Lugar Water, with an inflow from Belston Loch. Barlosh Farm lies to the west and Laigh Plaid borders the site. A small island is shown in the south-west area. 6" OS Retrieved : 2011-11-19 The loch in 1857 had a surface area of and the small island had trees upon it. Much of the surrounding land was very marshy at this time. 25" OS Map Retrieved : 2011-11-19 By 1896 only the core area of the loch still had open water and the island no longer existed as an independent entity. The 1950 aerial survey appears to show that the loch had been drained to the point where no open water was present. Air photo 2011-11-19 In the 1990s only a small area of marshy wetland is shown on the OS map Old Maps Retrieved : 2011-11-19
The area has seen extensive coal mining activity with an open cast mine and collieries at Drumsmodden, Polquhairn, Old Polquhairn, Auchlin, etc.
Early highways ran close to the loch, as indicated by names such as Glenconner, conaire being a Gaelic word for "path", and there is a farm called Rottenrow near to Glenconner, possibly derived from 'Route de Roi', or King's Highway. Old Roads of Scotland Retrieved : 2011-11-11
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