Approximately 1,200 metres (0.75 mi) from the dam is the reservoir's straining tower. Standing only 30 metres (98 ft) from the shore, its purpose is to filter or strain out material in the water with a fine metal mesh, before the water flows along the aqueduct to Liverpool.

Its architecture represents Gothic revival, built at the same time as Lake Vyrnwy dam. The tower as a whole is 47 metres (154 ft) tall, 32 metres (104 ft) of which is above water, and is topped with a pointed copper-clad roof, coloured light green.

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Make:	Canon
Model:	Canon EOS 7D Mark II
Exposure:	0.067 sec (1/15)
Aperture:	f/11.0
ISO Speed:	100
Focal Length:	100 mm
Lens:	EF75-300mm f/4-5.6