Geograph - photograph every grid square

Upper Neuadd Reservoir was built between 1896 and 1902 in part from limestone quarried near Dowlais brought in using a temporary railway line constructed from Torpantau halt on the Brecon & Merthyr Junction railway. This route is now a bridleway followed by the Taff Trail. Other stone was sourced from quarries between Pant and Pontsticill down the valley. With a water level of 1506ft, this reservoir is the highest in Fforest Fawr Geopark and indeed in Brecon Beacons National Park.

The Upper Reservoir has a capacity of 340 million gallons and the dam, seen here on the right, is 75ft high.

The ridge in the background is Tor Glas reaching over 600m in height. A snow storm was on its way, indicated by the ominous black clouds.