Showing posts with label Surveys: 02 Carnedd Llywelyn. Show all posts
Showing posts with label Surveys: 02 Carnedd Llywelyn. Show all posts

Monday, 12 January 2026

Mapping Mountains – Trimble Surveys – Carnedd Llywelyn


16.11.25  Foel Lus (SH 732 761) 

Foel Lus (SH 732 761)

In October 2018 I visited the lower hills of the north-eastern Carneddau during a 7 hour walk, taking in six hills, all of which were surveyed.  From the most westerly of these; Allt Wen (SH 745 772) I looked out across the intervening plain toward Foel Lus.  On that day the sky merged with the sea, all a glorious blue and Foel Lus peered back at me as a great inviting rounded lump of a hill.  I promised myself that one day I would visit.  Seven years later and that promise has finally been fulfilled.

I’d spent the previous evening in the company of the Steads, with Darrin celebrating his 60th birthday with wife Lisa, sons Tom and Will, and Tom’s girlfriend Lizzie.  It’s always good to see Lisa and Darrin, with past travels around Peru and Bolivia and lots of hill walks a reminder of our friendship.  The evening was great fun with lots of chat and silly games, all of which brought many laughs.

Just before breakfast I sorted my gear and checked the route to the hill, which was easy from where we were staying as it was only a matter of following the road around and then down, turning right and continuing up the ever increasingly steep Mountain Lane to its end where a rough track continues up toward Ty’n-y-ffrith farm.  I left the Steads having thanked them for a lovely evening as they were heading off for a walk to Aber waterfall before Will caught the afternoon train back to Leeds.

There were already two cars parked at the end of the lane when I arrived.  Beside one was a customised E-bike with some of the widest tyres imaginable, its owner was sitting on a near bench enjoying the view whilst having a bite to eat.  I sauntered over and chatted with him for a few minutes before gathering my rucksack and heading on the circuitous route around the hill.

According to the contours on my OS map, where I parked was around 250m high and with the hill being 360.0m in height, the walk wasn’t going to be too taxing.  That suited me as I was in a relaxed mode of travel with few worries fluttering around inside my head, and except for beating darkness on the drive home I wasn’t in a rush, which even on the slowest of slow walks I could easily accomplish.  Therefore, I happily headed off following a broad path heading initially north-westward around the hill. 

On the initial section of path

The weather forecast was good for the day, although high cloud only thinned later on and therefore there were few flashes of direct sunlight on the autumnal colours that still lingered amongst the land.

Away out to sea the elongated profile of Ynys Seiriol floated on the near horizon with the flatness of water seemingly enfolding Foel Lus.  There’s a special quality to walking beside the coast, this is prevalent whether beside the sea or elevated above it.  Its flat realms seem to add unexpected perspective to any view, and today my increasingly elevated position above the north Wales coast was one to be savoured.

The path continued contouring around the hill to its north, with the view now opening up to the north-east toward Allt Wen and its adjacent hills bringing memories of the walk I did in 2018.  On my way I passed a number of memorial plaques adorning the near rock, beside one was a small cave, and another a bench where no doubt people come, sit, remember and out across the expanse of sea disappearing in to the beyond. 

The memorials beside the path

As I crested the furthest north-easterly point of the path and just as I headed southward on it, a young guy appeared walking toward me from a slightly lower path, I said hello and tried to engage him without much luck as only a monosyllabic reply came my way.  Later as I plodded up the path leading to the summit he was already heading down, again little came my way except for a grunt of a ‘yes’ when I smiled and asked if he’d already been to the top.  I suppose it takes all sorts and perhaps he just wanted the solitude without a customary hello from a passing stranger. 

Gogarth is the distance with Allt Wen on the right

I took my time on the uphill and savoured the environment and rather ironically; the solitude!  Just before the high point I diverted to a prominent cairn giving views forever downward and across the sea.  The top of the hill was not far away and when I arrived it was for all too brief a moment bathed in direct sunlight emanating from a dappled and milky sky that clung above Tal y Fan to my south, with the ridges of the higher Carneddau peaks still cloud enshrouded beyond. 

The Gwynt y Môr wind farm

I stayed on top for a few minutes, having previously LIDARed the hill I did not bring the Trimble.  I’ve found the need to survey hills dimming in my old age, and have started to experience and enjoy the freedom that not always carrying the Trimble can give.  However, I found myself assessing the lay of land close to the summit windshelter for where I considered the high point of the hill was situated.  This made me smile as even without the Trimble it seems some habits are hard to break. 

The summit of Foel Lus

On my way down I said hi to a cyclist who was making good progress heading up.  He’d just overcome one of the steepest parts of the path and all without getting off his bike.  Two others had already passed me on my way up; I had then turned and watched them rhythmically curving their way down.  They seemed at one with the path as they swung left and then right, forming a pattern as the one behind quickly repeated what the other in front had just done.  I admired their skill, as I did with the cyclist now heading up the hill.  I remember my mountain bike days when downhill brought excitement and trepidation; this always seemed to be over too quickly before the next tiring uphill was tackled.  This gave little time for photography, which was one of the main reasons for concentrating more on hill walks.  Still, the outdoors is enjoyed by people doing many different activities and cycling off road brings its own exciting form of pleasure. 

Foel Lus from the south

I all too quickly left the rock strewn path and found my way on to a greened canvass which continued southward, here I veered right and followed a steepening rough track down to where my car was parked. 

Ynys Seiriol with the last remnants of autumnal colour in the foreground

Foel Lus certainly didn’t disappoint and proved an ideal way to end an excellent weekend. 

 

Survey Result: 

 

Foel Lus 

Summit Height:  360.0m (LIDAR) (significant height revision)  

Summit Grid Reference:  SH 73238 76184 (LIDAR)

Bwlch Height:  299.9m (LIDAR)

Bwlch Grid Reference:  SH 73386 75791 (LIDAR) 

Drop:  60.1m (LIDAR)

Dominance:  16.69% (LIDAR)

 

 

For further details please consult the Trimble Survey Spreadsheet 

Thursday, 6 April 2023

Mapping Mountains – Hill Reclassifications – Welsh Highlands – Uchafion Cymru


Craig Eigiau (SH 712 646) – Welsh Highland Sub addition 

There has been an addition to the listing of the Welsh Highlands – Uchafion Cymru, with the summit height, bwlch height and their locations, the drop and status of the hill derived from a Trimble GeoXH 6000 survey conducted by Aled Williams. 

Craig Eigiau (SH 712 646) (Photo: Aled Williams)

The criteria for the list that this addition applies to are:

Welsh Highlands – Uchafion Cymru Welsh hills at or above 500m in height with 15m minimum drop, with an accompanying sub list entitled the Welsh Highland Subs, the criteria for which is all Welsh hills at or above 500m in height with 10m or more and below 15m of drop.  This list is authored by Myrddyn Phillips and Aled Williams with the Introduction to the list published on Mapping Mountains in November 2015 and the latest update relating to the list published on Mapping Mountains in January 2023.

Welsh Highlands - Uchafion Cymru by Myrddyn Phillips and Aled Williams

The name the hill is listed by is Craig Eigiau and it is adjoined to the Carnedd Llywelyn group of hills, which are situated in the north-western part of North Wales (Region A, Sub-Region A1), and it is positioned with a minor road to its north-east, the A5 road to its south-west and the B5106 road and the A470 road to its east, and has the town of Llanrwst towards the east south-east. 

Extract from the Ordnance Survey 1:25,000 Explorer map

Prior to the survey with the Trimble GeoXH 6000 this hill was listed with 9.7m of drop, based on a 688.1m summit height and a 678.4m bwlch height, with both heights derived from LIDAR analysis conducted by Aled Williams.  Due to the marginal nature in the drop ascertained from LIDAR analysis, this hill was prioritised for a Trimble GeoXH 6000 survey and it is this result that is being prioritised. 

The Trimble GeoXH 6000 gathering data at the summit of Craig Eigiau (SH 712 646) (Photo: Aled Williams)

Therefore, the addition of this hill to Welsh Highland Sub status is due to a Trimble GeoXH 6000 survey, resulting in a 688.4m summit height and a 678.2m bwlch height, with these values giving this hill 10.2m of drop, which is sufficient for it to be classified as a Welsh Highland Sub. 

 

The full details for the hill are: 

Group:  Carnedd Llywelyn

Name:  Craig Eigiau

OS 1:50,000 map:  115

Summit Height:  688.4m (converted to OSGM15)

Summit Grid Reference:  SH 71280 64670

Bwlch Height:  678.2m (converted to OSGM15)

Bwlch Grid Reference:  SH 71218 64674   

Drop:  10.2m 

 

For the additions, deletions and reclassifications to the Welsh Highlands – Uchafion Cymru reported on Mapping Mountains please consult the following Change Registers:

 

Welsh Highland P15s

 

Welsh Highland Subs

 

Aled Williams and Myrddyn Phillips (April 2023)

  

Saturday, 11 March 2023

Mapping Mountains – Trimble Surveys – Carnedd Llywelyn


28.01.23  Craig Eigiau (SH 712 646) 

As the dawn became morning, a succession of steep hairpin bends gradually brought me to the farm of Rowlyn.  Having duly opened and closed a gate, I motored onwards along the narrow road to Cwm Eigiau with the high Carneddau ridge soon becoming visible, mottled with broken snow patches and enveloped with wisps of mist.  My progress then came to a sudden halt.  In front of me was an abandoned vehicle blocking the road with its offside front-wheel having broken off!  I jumped out of the car to inspect the grass beside the road and concluded that it was driveable to bypass the wreck.  The short offroad was tackled steadily and quickly and within a few minutes I had arrived at the car park in front of Llyn Eigiau. 

Breakdown (Photo: Aled Williams)

The plan for the morning was a north-south traverse of Craig Eigiau, with the objective being to survey a potential new P10 Sub-Top for The Welsh Highlands list.  Despite my early start, the car park was surprisingly almost full, with many having wild-camped on the hill the previous night.  Quick progress was made along the track that services the Melynllyn and Dulyn reservoirs and I soon found myself atop the first peak of the day, the Sub-Top of Clogwyn yr Eryr. 

Clogwyn yr Eryr (Photo: Aled Williams)

Dulyn (Photo: Aled Williams)

The views from this minor top were stunning, rewarding my earlier efforts in vacating the warmth of my bed in the dark depths of January!  To the south stretched Llyn Eigiau, perfectly reflecting the image of Pen Llithrig y Wrach that towered behind the lake.  To the west was the dark well of Dulyn, its cold waters gently coaxing mist downwards from the high Carneddau, with an alpine-like Carnedd Llywelyn sitting high above the cloudy scene. 

Carnedd Llywelyn (Photo: Aled Williams)

A series of chiselled outcrops appeared on the horizon, signalling my imminent arrival at the high point of the day, the 735.0m summit of Craig Eigiau.  Having crossed a bank of hard snow, a slippery scramble took me to the highest pinnacle of rock.  I stood at the summit for a few minutes admiring the rock architecture and the surrounding country, contemplating whether I had previously underrated the merits of this fine hill. 

The high point of the day (Photo: Aled Williams)

Craig Eigiau summit (Photo: Aled Williams)

With great expectation I headed southwards to survey the 688m summit of Craig Eigiau.  As I walked across the sodden expanse of montane grassland a frozen drizzle blew in from Carnedd Llywelyn.  Over my shoulder an arch of colour commanded my attention, transpiring as a rainbow straddling the Gletffordd plateau. 

Rainbow (Photo: Aled Williams)

Craig Eigiau rainbow (Photo: Aled Williams)

I was now face-to-face with my quarry, the Sub-Top of Craig Eigiau, resembling very much its higher neighbour albeit with muted grandeur.  A further belt of icy drizzle and mist blew in as I surveyed the critical bwlch of the hill, with data eventually gathered at two positions. 

The Sub-Top of Craig Eigiau (Photo: Aled Williams)

Summit of the Sub-Top (Photo: Aled Williams)

The high point proved relatively easy to identify, with an Abney level being used to verify the placement before data was collected with the Trimble.  As I headed down from the summit, a good number of alpine clubmoss (Diphasiastrum alpinum) plants were observed, being perfectly adept to the harsh winter environment on these mountains.  Also in their element were the mountain ponies of which the Carneddau claim their own unique breed of. 

Alpine clubmoss (Photo: Aled Williams)

Carneddau mountain ponies (Photo: Aled Williams)

A steep descent towards the old farm of Cwm Eigiau brought me onto the track that would lead me back to the awaiting car.  As I walked out of the valley, I thought about the people who once inhabited its upper regions, living their lives within its confines and thereby bringing a constant human presence.  In stark contrast, the Cwm Eigiau of today is a transient place.

Cwm Eigiau (Photo: Aled Williams)

 
Craig Eigiau (Photo: Aled Williams)

Aled Williams (January 2023) 

 

Survey Result: 

 

Craig Eigiau

Summit Height:  688.4m (converted to OSGM15) (significant height revision)

Summit Grid Reference:  SH 71280 64670

Bwlch Height:  678.2m (converted to OSGM15)

Bwlch Grid Reference:  SH 71218 64674

Drop:  10.2m (Welsh Highland Sub addition)

Dominance:  1.48%


 

For further details please consult the Trimble Survey Spreadsheet

  

Sunday, 21 July 2019

Mapping Mountains – Trimble Surveys – Carnedd Llywelyn


22.05.19  Maen Esgob (SH 748 759), Craig Celynnin (SH 746 733) and Cerrig y Ddinas (SH 754 739)

Cerrig y Ddinas (SH 754 739)

There are few places in Wales where two or more new P30s adjoined to one another are waiting to be found.  The north-eastern Carneddau is one such example, specifically the land adjoined to, and to the north-east of Tal y Fan, where three hills are situated that are potential new P30s; Maen Esgob, Craig Celynnin and Cerrig y Ddinas.

LIDAR analysis has helped in determining the P30 prospects of these three hills, and with Maen Esgob having broken through the magic P30 barrier all that remained was to confirm this with a Trimble survey.  The remaining two hills; Craig Celynnin and Cerrig y Ddinas have partial LIDAR coverage with Aled Williams having initially LIDARed the former’s bwlch and I then LIDARed the latter’s summit.  What was now required was a circuit of these three hills gathering Trimble bwlch and summit data for each.

There are limited parking places on the narrow roads leading in to these hills, but by 9.55am my car was squeezed off one of these lanes and I was heading on a track designated a public footpath leading to the house of Hafodty.

Some of the higher near hills were still blanketed by morning cloud caps, but otherwise conditions were perfect with a slight breeze and a comfortable walking temperature.  Beyond the house of Hafodty the track led to a path on upper grazing fields which soon came to another track which was my onward route toward Craig Celynnin after the planned survey of my first hill of the day; Maen Esgob.

Craig Celynin from the approach to Maen Esgob

The ten figure grid reference produced by LIDAR analysis for the bwlch of Maen Esgob zeroed me in to the position for Trimble placement, which was beside a greened track leading westward.  As the Trimble gathered data I walked further down the track to take a couple of photos of Llyn y Wrach, which today looked rather forlorn with dried outer edges and shallow water.

Gathering data at the bwlch of Maen Esgob

Llyn y Wrach

A good path led from the bwlch to the hill’s summit where before placing the Trimble on top of its flattish summit rock I tidied the remains of its cairn which had been pushed from its perch.  According to LIDAR this hill has 30.6m of drop and as such it means that Maen Esbob is Wales’ newest P30.

Gathering data at the summit of Maen Esgob

Once the Trimble had gathered its allotted data I packed it away and re-joined the greened track and followed it southward pausing at a stone circle on the way.  A number of these stones are now recumbent and embedded in the ground with two remaining uprights, one of which is tilted, but still looking impressive.

Maen Esgob from the approach to the stone circle

The most impressive of the monoliths

I passed a small herd of wild Carneddau ponies soon after and again stopped; these animals are always a joy to be near with their wildly wind-blown manes and dappled colouring.  Today the one that stood out was a brown foal who stood and watched me as I watched it framed by blackened burnt heather.

One of the wild Carneddau ponies

The greened track soon led me to a stream and then rising slopes toward the connecting bwlch of Craig Celynnin.  The critical point was again on a greened track, and after talking with a fell runner who was out scouting an upcoming event, I set the Trimble up and proceeded to gather its third data set of the day.

Gathering data at the bwlch of Craig Celynnin

Craig Celynnin is a potential new Pedwar and if it made the all-important 30m of drop it would be a fine addition to this list as its summit is crowned by a series of rocks, the highest of which soon had the Trimble aligned to its very highest point and individual datum points being gathered and stored.

By now the slight breeze of the morning had increased in strength, and as the Trimble gathered summit data on top of Craig Celynnin I sat on a near rock and looked out on this stunning part of Wales with breeze blown thoughts cascading through a contented mind.

Gathering data at the summit of Craig Celynnin

Leaving the summit I retraced my route back to the bwlch and continued around the northern part of Craig Celynnin on the greened track, only diverting from it in favour of a sheep path.  This led me to a walled greened track leading up and around to the old church of Llangelynnin, which nestles amongst the hills and almost merges with its landscape.

Llangelynnin

This church was mentioned in documents dated 1254, it breaths oldness and tranquillity, a place apart from modern day.  As I opened the heavy wooded door a sign above it made me smile. 

The sign above the front entrance

The interior transports back to a time and place now forgotten, with painting on the north wall of the chancel, including text and a skeletal figure looking rather ominous against the white washed interior walls.

Inside the old Church

I left and encountered increasing wind as the door was closed behind me.  A stoned ladder led over a near wall and gave access to the area of the connecting bwlch of my last hill of the day; Cerrig y Ddinas.  The bwlch was again beside a greened path, come track and as the Trimble slowly ebbed down to its 0.1m accuracy level before data should be logged, I sat on a near rock and luxuriated myself in the afternoon sunshine.  However, it took an age for this accuracy level to be attained, but once the 0.1m figure showed on the equipment’s screen I quickly pressed ‘Log’ and sat on my rock whilst data were gathered.

Gathering data at the bwlch of Cerrig y Ddinas

A path from the bwlch led around an intervening lump toward steepening slopes giving access to the rocky summit cone of Cerrig y Ddinas.  This consists of a huge rock tapered toward the customary drop, and by the time I arrived on its summit the breeze had developed to gusting wind, and with Trimble oblivion awaiting below the summit I set the equipment up aligned with the highest part of the summit rock, and attached it to its dog lead.  I use the dog lead as a safety precaution as it enables me to sit close to the Trimble and importantly below its internal antenna whilst data is gathered, and with the equipment attached to my hand via the lead, if it was blown off its airy perch I would be able to stop it tumbling to a rocky death many metres below.

The impressive summit rock of Cerrig y Ddinas

As the Trimble beeped away collecting its individual datum points I squeezed in to the rock below it and waited for the allotted data to be stored.  After taking a few photographs I gathered all my gear and made my way down to the leeward side of a near rock to sit and pack all necessary equipment away.

Gathering data at the summit of Cerrig y Ddinas

It was only a short walk from the summit retracing my inward route toward a fence, which gave access down grazing fields toward a gate and the narrow lane which led back to my car.  The walk had taken five hours with six data sets taken and three hills visited, with some interesting results pending!


Postscript:  Two out of three new P30s ain’t bad!



Survey Result:



Maen Esgob

Summit Height:  300.0m (converted to OSGM15)

Summit Grid Reference:  SH 74877 75900

Bwlch Height:  269.2m (converted to OSGM15)

Bwlch Grid Reference:  SH 74870 75664


Dominance:  10.26%





Craig Celynnin

Summit Height:  404.8m (converted to OSGM15) (significant height revision)

Summit Grid Reference:  SH 74667 73373

Bwlch Height:  377.1m (converted to OSGM15)

Bwlch Grid Reference:  SH 74604 73263

Drop:  27.7m

Dominance:  6.85%





Cerrig y Ddinas

Summit Height:  313.5m (converted to OSGM15)

Summit Grid Reference:  SH 75427 73948

Bwlch Height:  283.0m (converted to OSGM15)

Bwlch Grid Reference:  SH 75140 73786


Dominance:  9.73%