Llyn Cwellyn

Llyn Cwellyn

Llyn Cwellyn

Date

22 March 2015
Location

Llyn Cwellyn

SH 55842 55411; 53.07640°N, 4.15340°W

Information

“The next morning I pursued my excursion up the narrow vale watered by the Colwyn, and, through a wildly variegated land scape, came to the lakes near the foot of Mynydd Mawr, a vast precipice, presenting its bold, picturesque outline against the skies; it now threw its broadest shadow over hill, and rock, and vale, while the deep, clear waters of the neighbouring lakes, under the passing shadow of the clouds, — dispersing before the glowing sun, — produced a strangely varied and most pleasing effect. Proceeding on my right along the stupendous base of Snowdon, where the path to its loftiest summit first appears, I rambled towards the romantic Cwellyn,* known to have been long in possession of a family of the same name now extinct.

* Celebrated of old for the surpassing flavour of its char ; and, like most of the lakes and streams round Beddgelert, affording admirable scope for the genius of the angler.”

— Thomas Roscoe, Wanderings and Excursions in North Wales, 1836

Llyn Cwellyn is a natural glacial lake on the Afon Gwyrfai river in the Nant y Betws valley between Mynydd Mawr and the Snowdon massif. The lake, which supports a natural population of Arctic char, has an area of 87 hectares and has a maximum depth of 37 m.

Formerly owned by the Marquis of Anglesey, Llyn Cwellyn is dammed at its nothern end and serves as a reservoir supplying water to around 76,000 people in parts of Gwynedd and south Anglesey.

In 2005 there was a local outbreak of cryptosporidiosis – a stomach bug caused by a parasitic intestinal infection – in which there were 231 confirmed cases. The source of the outbreak was traced to contaminated water from Llyn Cwellyn, with the nearby Rhyd-Ddu sewage treatment works being identified as a possible original source of the cryptosporidium, which is resistant to chlorine dosing. The water company Dwr Cymru had to issue a ‘boil water’ notice to approximately 37,000 households and introduced ultraviolet disinfection as a short-term measure to deal with the problem. The company was, however, fined £60,000 in 2007 for failing to provide drinking water fit for consumption during the incident. Dwr Cymru subsequently invested £13 million in upgrading its Cwellyn Water Treatment Works, located in Betws Garmon, 2.3 km from the northern end of the reservoir. Construction started in 2009 and the new treatment plant was commissioned in 2010.

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Garreg Fawr Aerial Ropeway

Garreg Fawr Aerial Ropeway

Garreg Fawr Aerial Ropeway

Date

26 July 2014
Location

Betws Garmon

SH 54259 58165; 53.10070°N, 4.17826°W

Information

In 1907 Alfred Hickman Ltd acquired Garreg Fawr iron mine and embarked upon a major redevelopment programme. As part of this work, a 4.7 km-long aerial ropeway was constructed in order to transport crushed ore from the mine to the railway (the LNWR) at Llanberis on the other side of Moel Eilio. The ropeway was supported by steel pylons fixed to masonry bases. The buckets it conveyed each had a capacity of 300 kg. The first leg of their journey was northwards to a corner base where the ropeway turned north-eastwards taking it up over the shoulder of the mountain and thence down to a terminus on the banks of Lyn Padarn in Llanberis.

 

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Glanrafon Slate Quarry

Glanrafon Slate Quarry

Glanrafon Slate Quarry

Date

25 January 2014
Location

Rhyd-Ddu

SH 57824 53895; 53.06331°N, 4.12317°W

Information

Glanrafon Slate Quarry sits on the 300m contour line on the western flank of Snowdon close to the village of Rhyd-Ddu. The quarry, which was the largest in the locality, dates from 1875 and was shown as being in use on the Ordnance Survey maps from 1889-1915. Notice was given of the winding up of the Glanrafon Slate Quarry Company in The Edinburgh Gazette in January 1917.

Further Reading

Glanrafon Slate Quarry Company 1902 price list (Slatesite);
Glanrafon Quarry (Royal Commission on the Ancient and Historical Monuments of Wales)

 

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Mynydd Mawr – De Havilland Mosquito, W4088, 51 Operational Training Unit, 1 Nov 1944

Mynydd Mawr - Mosquito, W4088 - Looking towards Llyn Cwellyn and Snowdon (B)

Site visited 20 June 2010 Location Mynydd Mawr, Wales
(A) SH 54337 55131; 53.07348°N, 4.17572°W
(B) SH 54414 55151; 53.07367°N, 4.17459°W
(C) SH 54483 55187; 53.07402°N, 4.17357°W
(D) SH 54532 55181; 53.07398°N, 4.17284°W
(E) SH 54210 55244; 53.07446°N, 4.17766°W
Aircraft
Manufacturer De Havilland Registration W4088
Model Mosquito Unit 51 Operational Training Unit
Crash date 1 November 1944
Further Information
Peak Wreck Hunters; Mosquito (Wikipedia)

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Mynydd Mawr – De Havilland Vampire, VZ874, No. 7 Flying Training School, 12 Oct 1956

Mynydd Mawr - Vampire, VZ874 (looking towards Dyffryn Nantlle)

Site visited 20 June 2010 Location Mynydd Mawr, Wales
SH 53985 54618
53.06878°N, 4.18075°W
53°04.127’N, 4°10.845’W
Aircraft
Manufacturer De Havilland Registration VZ874
Model Vampire Unit No. 7 Flying Training School
Crash date 12 October 1956
Further Information
Peak Wreck Hunters; Vampire (Wikipedia)

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