Loch More, Caithness

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Loch More
Outflow from Loch More - geograph.org.uk - 5987288.jpg
Outflow from Loch More
Caithness UK relief location map.jpg
Red pog.svg
Loch More
Location Caithness, Scotland
Coordinates 58°23′16″N3°34′44″W / 58.38778°N 3.57889°W / 58.38778; -3.57889
Type loch
Primary inflows River Thurso
Primary outflows River Thurso
Catchment area 67.5 sq mi (175 km2)
Basin  countriesScotland
Max. length1.7 mi (2.7 km)
Max. width13 mi (0.54 km)
Surface area511 acres (0.8 sq mi; 2.1 km2)
Max. depth27 ft (8.2 m)
Surface elevation393 ft (120 m)

Loch More (great Loch in Gaelic) is a freshwater loch in Caithness, Scotland, about 14 miles (23 kilometres) south of Thurso. [1] It is a shallow flat-bottomed basin, in common with most of the nearby lochs. [2] [3]

The overflow from the loch is taken by the River Thurso, which, after a windy course of 26 miles (42 kilometres), flows into the Pentland Firth at the town of Thurso. The main inflow comes from the Sleach Water and the upper part of the River Thurso (also known here as Strathmore water). The latter is formed by a union of Rumsdale Water (source Rumsdale Loch) and Glut Water, whose source to the south-west is at a height of around 1,400 ft (430 m), about 14 miles (23 kilometres) upstream from Loch More. [2] [1]

The loch was originally an irregular round shape, less than a mile across, with a surface area of about 177 acres (0.3 square miles; 0.7 square kilometres). The average depth was only 7 ft (2.1 m) reaching a maximum of about 15 ft (4.6 m). However, in 1907-1908 a dam was built at the outflow into the River Thurso, which raised the level of the loch by 12 ft (3.7 m). Its purpose was to control the amount of water in the downstream River Thurso, thus improving the quality of salmon fishing. As a result, the area of the loch increased to 511 acres (0.8 square miles; 2.1 square kilometres), with a depth up to a maximum of 27 ft (8.2 m), depending on the amount of water discharged. [2] [4] The length of the loch is now 1.7 miles (2.7 kilometres). [5]

The area draining into Loch More is about 67.5 square miles (175 square kilometres), an area 240 times greater than the original size of the loch, an unusually large catchment area for such a small body of water. [2]

The loch is about 393 ft (120 m) above sea level. [2] [4]

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References

  1. 1 2 Ordnance Gazetteer of Scotland, by Francis H. Groome; publ. Thomas C. Jack, Edinburgh,1901. (Article on Halkirk)
  2. 1 2 3 4 5 Bathymetrical Survey of the Scottish Fresh-Water Lochs, ed. Sir John Murray K.C.B., F.R.S., D.Sc., and Laurence Pullar F.R.S.E., F.R.G.S., publ. Challenger Office, Edinburgh, 1910; Vol II, part 2, p. 19
  3. Bartholomew's Half Inch to Mile Map of Scotland - Sheet 27 Caithness; publ. John Bartholomew, 1929
  4. 1 2 The Salmon Rivers and Lochs of Scotland, by W. L. Calderwood, F.R.S.E., publ. Edward Arnold, London, 1909; pp.247-249
  5. Ordnance Survey 1:25,000 maps of Great Britain Sheet 39/04 – A, Revised 1905-1946, publ. Ordnance Survey, 1950