Twmpau - 500m 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 - 500m 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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Moel Wnion579.911517SH 64972 69708 (S)103.6SH 65201 68803 (S)uom476.3Triangulation pillar with 580.339m flush bracket height once situated on the summit area is documented on the 03.09.03 as being destroyed. 579.9m summit height and 476.3m bwlch height (103.6m drop) from a Trimble GeoXH 6000 survey conducted by Myrddyn Phillips.
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Yr Orsedd55911517
SH 69357 71544 (HH)
45
SH 69581 71404 (SH)
uom514
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Craig Wen54811517
SH 72906 60283 (HH)
c51SH 72972 60445 (I)Bwlch Mignogc497
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Moel Eilio54611517
SH 74737 65907 (HH)
93
SH 73927 64756 (SH)
uom453
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Y Gurn541.311517SH 64739 68792 (S)45.1SH 64871 69070 (S)uom496.2Hill name written as Gyrn on current Ordnance Survey maps. 541.3m summit height and 496.2m bwlch height (45.1m drop) from a Trimble GeoXH 6000 survey conducted by Myrddyn Phillips.
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Foel Ganol53611517
SH 68804 71595 (HH)
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SH 69005 71538 (SH)
uom496Hill name written as Foel-ganol on current Ordnance Survey maps.
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Pt. c 590mc59011517SH 72658 63992 (HH)c26SH 72638 63563 (I)uom564
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Cefn Cyfarwydd50311517SH 75204 63070 (HH)26SH 74815 62813 (SH)uom477
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Pen y Gadair50711517SH 73348 69363 (HH)c21SH 73174 69182 (I)uomc486Hill name written as Penygadair on current Ordnance Survey maps.
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Moel Hebog
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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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Moel Ddu55312418
SH 57965 44213 (HH)
198
SH 57574 44928 (SH)
Bwlch Cwm Ystradllyn
355Hill name written as Moel-ddu on current Ordnance Survey maps. Bwlch name taken from the Ordnance Survey enlarged Geograph map. Bwlch name written as Bwlch Cwm-ystradllyn on the current Ordnance Survey enlarged Geograph map. Drop value taken from the 355m bwlch height on the Ordnance Survey enlarged mapping on the Geograph website.
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Bryn Bannogc52011517, 18
SH 57613 45727 (HH)
c63SH 57427 46053 (I)uom457Hill name written as Bryn Banog on current Ordnance Survey maps.
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Pt. 534m53412418SH 57458 44184 (HH)29SH 57628 44177 (I)uom505
Drop value taken from a 29.1m basic levelling survey conducted by Myrddyn Phillips.
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Pen Llŷn
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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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Garn Ganol560.7123
253, 254
SH 36490 44743 (TP)
c430SH 45347 48569 (I)uomc131Name taken from the Cardinal Hill name in the Y Pedwarau booklet by Phillips/Williams (Europeaklist 2013). Also recorded by the Ordnance Survey as Yr Eifl. Summit position and 560.7m height from a Leica Differential GPS survey conducted by G&J Surveys. Triangulation pillar with 564.184m flush bracket height situated at the top of a large ancient cairn.
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Gurn Ddu522.1
115, 123
254SH 40114 46783 (S)c386SH 38818 44533 (I)uomc136Name composition taken from the Cardinal Hill name in the Y Pedwarau booklet by Phillips/Williams (Europeaklist 2013), with the hill name written as Gyrn Ddu on current Ordnance Survey maps. 522.1m summit height from a Trimble GeoXH 6000 survey conducted by Myrddyn Phillips.
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Bwlch Mawr510.3
115, 123
254SH 42673 47851 (S)145
SH 41424 46658 (SH)
uom365Summit position and 510.3m height from a Leica Differential GPS survey conducted by G&J Surveys and a Trimble GeoXH 6000 survey conducted by John Fitzgerald. Drop value taken from the 365m bwlch height on the Ordnance Survey enlarged mapping on the Geograph website.
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Moelwynion
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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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Y Ro Wen59911518
SH 74590 50019 (HH)
122
SH 73916 48113 (SH)
uom477Summit height taken from the Ordnance Survey enlarged mapping on the Geograph website.
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Carnedd y Cribau59111517
SH 67620 53698 (HH)
83
SH 67628 54139 (SH)
Bwlch Rhiw'r Ychen508
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Yr Arddu58911517
SH 67344 50707 (HH)
c37SH 66832 50049 (I)uomc552
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Graig Goch58812418
SH 75126 44721 (HH)
122
SH 73957 45053 (SH)
uom466Summit height taken from the 1,928ft (587.7m) height on the Ordnance Survey 1:10,560 map. Drop value taken from the 466m bwlch height on the Ordnance Survey enlarged mapping on the Geograph website and from the Harvey 1:40,000 British Mountain Map.
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Foel Fras58511518
SH 72803 48165 (HH)
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SH 72273 48225 (SH)
uom551Hill name written as Foel-fras on current Ordnance Survey maps. Summit height taken from the 1,920ft (585.2m) levelled height on the Ordnance Survey 1:10,560 map. Drop value taken from a 34.1m basic levelling survey conducted by Myrddyn Phillips.
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Moel Farlwyd57711518
SH 70741 48647 (HH)
c99SH 71226 48727 (I)uomc478
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Pt. 554m55411517
SH 68530 46413 (HH)
30.6
SH 68346 46616 (HH)
uom523Drop value taken from a 30.5m automatic level and staff survey conducted by G&J Surveys.
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Y Garnedd55212418
SH 74203 43118 (HH)
c75SH 74951 43676 (I)uomc477Position of alternate bwlch at SH 747 436 has also been estimated as being c 477m high.
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Pt. 528m527.811518SH 78405 47065 (S)80
SH 77019 45245 (SH)
uom448Summit position and 527.8m height from a Leica Differential GPS survey conducted by G&J Surveys.
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Moel Dyrnogydd52411518
SH 69547 49138 (HH)
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SH 69522 48876 (SH)
Llyn Dyrnogydd458Drop value taken from the 458m bwlch height on the Ordnance Survey enlarged mapping on the Geograph website.
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Manod Bach51112418
SH 71407 44759 (HH)
c96SH 71787 45237 (I)uomc415
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Foel Boeth50911618
SH 80481 47800 (HH)
c70SH 79425 46284 (I)uomc439
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Pt. 502m50212418
SH 74379 44069 (HH)
c33SH 74435 44350 (I)Llynnau Gamalltc469
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Carreg y Foel Gronc50112418SH 74469 42767 (HH)26.5SH 74594 42836 (HH)Foel Gron Quarryc474Hill name written as Carreg y Foel-gron on current Ordnance Survey maps. Drop value taken from a 26.5m automatic level and staff survey conducted by G&J Surveys.
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Iwerddon58311517SH 68822 48217 (HH)25.2SH 68409 47880 (HH)Bwlch y Moch558Bwlch name taken from the Ordnance Survey enlarged mapping on the Geograph website. Drop value taken from a 25.2m automatic level and staff survey conducted by G&J Surveys.
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Cerrig Cochionc55011517SH 66255 51066 (HH)24SH 66171 50988 (I)uomc526
Drop value taken from a 23.9m basic levelling survey conducted by Myrddyn Phillips.
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Pt. 527m527.311518SH 77917 46986 (S)23.3SH 78129 46972 (S)uom504527.3m summit height and 504.0m bwlch height (23.3m drop) from a Leica Differential GPS survey conducted by G&J Surveys.
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Foel Ddu58911517SH 66973 46029 (HH)23SH 66965 45739 (SH)uom566Bwlch height taken from the Ordnance Survey enlarged mapping on the Geograph website. Drop value taken from a 22.9m basic levelling survey conducted by Myrddyn Phillips.
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Craig Llyn Llagic59811517SH 65250 48060 (I)22SH 65244 47864 (I)Llyn yr Adarc576Hill name written as Craig Llyn-llagi on current Ordnance Survey maps. Drop value taken from a 22.3m basic levelling survey conducted by Myrddyn Phillips.
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Clogwyn Bwlch y Maen54811517SH 67908 54271 (HH)22SH 68015 54319 (SH)Bwlch Clorad526Hill name written as Clogwyn Bwlch-y-maen on current Ordnance Survey maps.
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Pt. 578mc57811517SH 66313 50006 (I)21SH 66284 50111 (I)uomc557Drop value taken from a 21.3m basic levelling survey conducted by Myrddyn Phillips. Unprocessed data of 574.6m summit height and 552.9m bwlch height (21.7m drop) from a Leica Differential GPS survey conducted by G&J Surveys.
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Ro Lwyd53311518SH 76117 50527 (SH)20SH 76025 50551 (I)uom513
Drop value taken from a 20.4m basic levelling survey conducted by Myrddyn Phillips.
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Mynydd Hiraethog
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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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Mwdwl Eithin53211618, 264
SH 91709 54055 (TP)
263
SH 92868 49945 (SH)
uom269Hill name written as Mwdwl-eithin on current Ordnance Survey maps. Triangulation pillar with 531.876m flush bracket height situated on the summit area.
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Marial Gwyn519.5116264SH 99972 55635 (S)139.9SH 91663 56792 (S)Llyn Aled379.6Also recorded by the Ordnance Survey as Foel Gôch (sic). 519.5m summit height and 379.6m bwlch height (139.9m drop) from a Leica RX1250 survey conducted by Alan Dawson. Triangulation pillar with 519.781m flush bracket height situated on the summit area.
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Gorsedd Brân518116264
SH 96915 59748 (TP)
c121SH 97988 58684 (I)uomc397
Triangulation pillar with 517.855m flush bracket height situated on the summit area.
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Craig Bronbannog501.8116264SJ 01682 52008 (S)100.4SJ 01242 52898 (I)uom401.4Hill name written as Craig Bron-banog on current Ordnance Survey maps. 501.8m summit height and 401.4m bwlch height (100.4m drop) from a Leica Differential GPS survey conducted by G&J Surveys, with the top at SJ 018 519 being 501.3m high.
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Bryniau Clwyd
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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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Moel y Gamelin576.9116
255, 256
SJ 17634 46515 (S)c382SJ 06863 47738 (I)uomc195576.9m summit height from a Trimble GeoXH 6000 survey conducted by Myrddyn Phillips.
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Cyrn y Brain564.6117256SJ 20820 48875 (S)164SJ 19343 48178 (S)Horseshoe Pass400.5Hill name written as Cyrn-y-Brain on current Ordnance Survey maps. Triangulation pillar with 562.356m flush bracket height situated north-eastward of summit at SJ 21367 49648.
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