page_title: Radyr
section_title: Radyr Weir
hierarchical_section_title: Radyr / Geography / Radyr Weir
caption_attribution_description: English: Radyr Weir taken from the train
context_page_description: Radyr is an outer suburb of Cardiff, about 4 miles northwest of Cardiff city centre. Radyr is part of Radyr and Morganstown Community, for which the 2011 Census recorded a population of 6,417.
  Morganstown is north of Radyr, on the other side of the M4 Motorway. Neighbouring communities are Whitchurch to the east on the opposite bank of the River Taff, Pentyrch to the west with St Fagans and Llandaff to the south.
context_section_description: The River Taff at this point runs roughly south through Taff's Well, past Radyr and through Llandaff.
  Radyr Weir was built in 1774 to divert water into a leat to the Melingriffith Tin Plate Works. The weir is the third obstacle to migratory salmon and sea trout — the others being Llandaff Weir and Blackweir, both of which also have fish passes. Since the early 1980s, the salmon and sea trout stocks in the Taff have been recovering from nearly 200 years of industrial pollution and exploitation. In 1993 the National Rivers Authority monitored over 500 salmon and 700 sea trout returning to the river to spawn.
  From 1749, iron from Pentyrch was initially transported to the works using pack-horses, then tub boats were used on the Taff passing onto the feeder via a lock at Radyr Weir. Parts of this lock can still be seen beside the feeder sluice. In 1815 the tub boats were discontinued and a tramway built along the Taff. There is a public picnic site by the Radyr weir.
  A hydro-electric scheme was built in 2016 on Radyr Weir to generate renewable energy. The Radyr Weir scheme channels more than 500 million cubic metres of water per year through two screw turbines and is expected to generate 400 kW — enough energy to power three of the city’s leisure centres — which will save 700 tonnes of CO₂ annually.
  The River Taff through Radyr is flanked on both sides by an undeveloped greenway that passes uninterrupted through northern Cardiff all the way to Cardiff Castle in the centre of the city, before the river enters Cardiff Bay.
caption: Radyr Weir
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