View of Ffynnon Llugwy – Carnedd Llewelyn loop from Dolgarrog
View of Ffynnon Llugwy – Carnedd Llewelyn loop from Dolgarrog
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View of Ffynnon Llugwy – Carnedd Llewelyn loop from Dolgarrog
06:00
16.9km
940m
Hiking
Hard hike. Very good fitness required. Easily-accessible paths. Suitable for all skill levels. The starting point of the route is right next to a parking lot.
Last updated: April 19, 2026
Tips
Your route passes through a protected area
Please check local regulations for:
Waypoints
Start point
Parking
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1.60 km
Eigiau Dam Ruins
Highlight • Structure
On 2 November 1925 the failure of two dams caused a flood that swamped the village of Dolgarrog, killing 16 people. The disaster was started by the failure of the Eigiau Dam, a gravity dam owned by the Aluminium Corporation. The water released from the reservoir flooded downstream,[10] and overtopped the Coedty Dam, an embankment dam. This dam also subsequently failed, releasing the huge volume of water that flooded Dolgarrog.[11] Many more villagers could have been killed had they not been in the local theatre watching a film that night.
The disaster at Dolgarrog led the British parliament to pass the Reservoirs (Safety Provisions) Act in 1930, which introduced laws on the safety of reservoirs. This has since been updated, and the current one is the Reservoirs Act, 1975.
Tip by
5.50 km
Pen Llithrig y Wrach
Highlight • Viewpoint
It has one of the more colourful names of any British mountain, translating as slippery peak of the witch, perhaps in reference to the boggy conditions underfoot, or because of the resemblance of its pointed profile to an archetypal witch's hat.
It is an outlier of the Carneddau, the higher peaks of which can be reached from Pen Llithrig y Wrach via Pen yr Helgi Du. On its eastern side, the mountain slopes steeply down to Llyn Cowlyd.
It may be climbed from the southern side, from Capel Curig or the A5, or from the north-east, from Dolgarrog or Tal-y-bont in the Conwy valley. It is quite prominent when viewed from the north near Llandudno.
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7.58 km
Pen Yr Helgi Du
Highlight • Viewpoint
Tip by
8.09 km
Y Garn Ridge and Cliffs
Highlight • Climb
Tip by
8.17 km
Bwlch Eryl Farchog
Highlight (Segment) • Climb
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8.52 km
View of the Carneddau Mountains
Highlight • Viewpoint
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8.69 km
View of Ffynnon Llugwy
Highlight • Lake
Since the mid 1970s the lake has additionally acted as a reservoir for Bangor and eastern Anglesey, which necessitated the laying of an 11-mile pipeline to the water treatment works at Mynydd Llandegai.
Afon Llugwy which flows via Capel Curig and Betws-y-coed before becoming a tributary of the River Conwy.
Tip by
9.82 km
Carnedd Llewelyn
Highlight • Natural Monument
Tip by
16.9 km
End point
Parking
Way Types & Surfaces
Way Types
8.48 km
8.34 km
< 100 m
Surfaces
8.49 km
4.12 km
2.23 km
2.01 km
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Elevation
Highest point (1,050 m)
Lowest point (370 m)
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Weather
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Wednesday 13 May
8°C
3°C
43 %
Additional weather tips
Max wind speed: 22.0 km/h
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