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Photo: Llanishen Reservoir (semi-drained) - north view.jpg via Wikidata Q6661626 License
Llanishen Reservoir
Reservoir
Cool today
Llanishen Reservoir (Welsh: Cronfa Ddŵr Llanisien) is a Victorian reservoir in north Cardiff, Wales. The reservoir is one of the reservoirs constructed as part of the Taff Fawr scheme for supplying water to Cardiff and was completed in 1886. It forms part of the Nant Fawr Corridor from the top of Roath Park to the countryside beyond Cyncoed.
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Weather at Llanishen Reservoir
52°F, Overcast · H 52° / L 45° · 87% chance of rain3-day forecast
H: 52° L: 45°
Overcast

52°
|
Feels like 42°
Precipitation
87%
Humidity
62%
Wind
23 mph
UV Index
0.3
Weather notes:
🏄Good for surfing/sailing
12 AM

45°
3 AM

49°
6 AM

50°
9 AM

46°
12 PM

49°
3 PM

52°
6 PM

49°
9 PM

49°
Frequently asked questions
- Where is Llanishen Reservoir?
- Llanishen Reservoir is a reservoir in Wales.
- Can you swim at Llanishen Reservoir?
- There is no fixed answer for Llanishen Reservoir: whether it is safe to swim there on a given day depends on the water temperature, recent rainfall, and any advisories posted at Llanishen Reservoir 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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