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Photo: Marchlyn Mawr from Elidir Fawr - geograph.org.uk - 8192.jpg via Wikidata Q3403893 License
Marchlyn Mawr
Reservoir
Cool today
Marchlyn Mawr reservoir is a high level lake in Snowdonia behind Elidir Fawr mountain. It is used as the high level water source for Dinorwig power station, a closed-loop pumped storage hydroelectric generating facility. It is said that nearby lies the cave containing Arthur's treasure, a source of bedazzlement to the wanderer who sees it, and of disaster to the pilferer who touches it.
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Weather at Marchlyn Mawr
46°F, Partly Cloudy · H 48° / L 38° · 91% chance of rain3-day forecast
H: 48° L: 38°
Partly Cloudy
46°
|
Feels like 44°
Precipitation
91%
Humidity
91%
Wind
5 mph
UV Index
1
12 AM
46°
3 AM
48°
6 AM
42°
9 AM
39°
12 PM
38°
3 PM
38°
6 PM
43°
9 PM
46°
Frequently asked questions
- Where is Marchlyn Mawr?
- Marchlyn Mawr is a reservoir in Wales.
- Can you swim at Marchlyn Mawr?
- There is no fixed answer for Marchlyn Mawr: whether it is safe to swim there on a given day depends on the water temperature, recent rainfall, and any advisories posted at Marchlyn Mawr in Wales. Check current water conditions before you go, and follow posted signs and local guidance.
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Location & Contact
Wales
🏞️ Best times & visiting tips
- ›Check for boat launch facilities and fees
- ›Obtain required fishing licenses before arrival
- ›Be aware of lake-specific regulations and restrictions
- ›Monitor water quality reports before swimming
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