Eigiau Dam Ruins – Carnedd Llewelyn loop from Dolgarrog
Eigiau Dam Ruins – Carnedd Llewelyn loop from Dolgarrog
4.8
(8)
43
hikers
Eigiau Dam Ruins – Carnedd Llewelyn loop from Dolgarrog
05:03
15.3km
700m
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: May 7, 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
4.63 km
Quarry Ruins in Eryri National Park
Highlight • Historical Site
Beautiful place with lots of sheep and a spectacular view of the valley.
Translated by Google •
Tip by
8.32 km
Carnedd Llewelyn
Highlight • Natural Monument
Tip by
8.33 km
Carnedd Llewelyn Summit
Highlight • Summit
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The eleventh summit of the Welsh 3000s and the highest mountain in the Carneddau Mountains offer a beautiful view of Lake Ffynnon Llugwy. From here you can reach the summit of Yr Elen over a narrow ridge.
Translated by Google •
Tip by
15.3 km
End point
Parking
Way Types & Surfaces
Way Types
10.8 km
4.47 km
< 100 m
Surfaces
9.62 km
2.32 km
2.01 km
1.34 km
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Elevation
Highest point (1,050 m)
Lowest point (370 m)
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Weather
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Monday 13 July
23°C
9°C
0 %
Additional weather tips
Max wind speed: 15.0 km/h
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Our route recommendations are based on thousands of hikes, rides, and runs completed by other people on komoot.
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