Twmpau - 900m P30 List
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© 2013 - 2016 Myrddyn Phillips. Non-commercial copying is permitted provided attribution is preserved. Re-use of the presented data in this or another format requires the permission of the blog author.
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Contains OS Data Crown copyright and database rights 2016, licensed under the OGL (see at http://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/ ).
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Twmpau - 900m P30 List
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Carneddau
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NameSummit Height (m)1:50,000 Map1:25,000 MapSummit Grid ReferenceDrop (m)Bwlch Grid Reference
Bwlch Name / Feature
Bwlch Height (m)Notes
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Pen yr Ole Wen97811517
SH 65598 61947 (HH)
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SH 65464 62194 (SH)
Bwlch yr Ole Wen933
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Foel Grach97611517
SH 68881 65908 (HH)
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SH 68899 65258 (SH)
Gwaun y Garnedd936Emergency mountain refuge situated just below the summit.
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Yr Elen96211517
SH 67389 65117 (HH)
c54SH 67649 64728 (I)uomc908
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Foel Frasc94411517
SH 69614 68122 (HH)
c61
SH 68822 66534 (SH)
uom883Hill name written as Foel-fras on current Ordnance Survey maps. Estimated summit height taken from the highest embedded rock compared to the position of the 943.051m flush bracket height on the triangulation pillar which is situated on the summit area. Drop value taken from the 883m bwlch height on the Ordnance Survey enlarged mapping on the Geograph website.
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Carnedd Uchaf92611517
SH 68699 66905 (HH)
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SH 69169 67343 (SH)
uom894The name Carnedd Gwenllian was accepted by the Ordnance Survey as an official name for this hill and announced on the 26/09/2009. Drop value taken from the 894m bwlch height on the Ordnance Survey enlarged mapping on the Geograph website.
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Glyderau
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NameSummit Height (m)1:50,000 Map1:25,000 MapSummit Grid ReferenceDrop (m)Bwlch Grid Reference
Bwlch Name / Feature
Bwlch Height (m)Notes
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Glyder Fach994.311517
SH 65641 58286 (S)
74.5SH 65272 58156 (S)Bwlch y Ddwy Glyder919.8Bwlch name written as Bwlch y Ddwy-Glyder on current Ordnance Survey maps. 994.3m summit height and 919.8m bwlch height (74.5m drop) from a Trimble GeoXH 6000 survey conducted by Myrddyn Phillips. Embedded bolt in rock with height of 993.648m situated on the summit area.
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Y Garn94711517
SH 63092 59571 (HH)
236
SH 63598 58491 (SH)
Llyn y Cŵn711
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Elidir Fawr92411517
SH 61193 61301 (B)
c213SH 62596 61396 (I)Bwlch y Brecanc711
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Tryfan917.511517
SH 66408 59390 (S)
c192SH 66169 58780 (I)Bwlch Tryfanc725Summit position and height of 917.48m from a Leica Differential GPS survey conducted by G&J Surveys.
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Yr Wyddfa
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NameSummit Height (m)1:50,000 Map1:25,000 MapSummit Grid ReferenceDrop (m)Bwlch Grid Reference
Bwlch Name / Feature
Bwlch Height (m)Notes
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Crib Goch92311517
SH 62425 55189 (HH)
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SH 62173 55112 (SH)
Bwlch Coch858
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Aran
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NameSummit Height (m)1:50,000 Map1:25,000 MapSummit Grid ReferenceDrop (m)Bwlch Grid Reference
Bwlch Name / Feature
Bwlch Height (m)Notes
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Aran Fawddwy905.6124, 12523
SH 86270 22386 (S)
671
SH 85054 26799 (SH)
uom235905.6m summit height from a Leica RX1250 survey conducted by Alan Dawson. Triangulation pillar with 906.780m flush bracket height situated on the summit area. Drop value taken from the 235m bwlch height on the Ordnance Survey 1:50,000 Landranger map.
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List Totals: P30s 11 Sub-List 0
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