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The River Nidd is a tributary of the River Ouse in North Yorkshire. The Yorkshire Dales Rivers Trust YDRT has a remit to conserve the ecological condition of the river Nidd from its headwaters to the Humber estuary. The river gets its name for the Celtic word for brilliant.
The upper river valley, Nidderdale, was designated an Area of Outstanding Natural Beauty in 1994.
The river is 95 Km long.
Wikipedia: Link

The Nidd viaduct at Bilton which stands at 104 feet above the river was built in 1848 and was part of the now defunct railway line which used to run to Ripley, Ripon and Thirsk, carrying freight (mainly coal and later gas) and passengers until it closed in 1967.
Grade II listed. Link

Nidd Gorge makes up a section of the River Nidd in North Yorkshire, in which the river enters a deep ravine with sheer, tree covered valley sides. The river as a whole flows from its source near Great Whernside in Nidderdale (part of the Yorkshire Dales), to its confluence with the River Ouse near Nun Monkton. Nidd Gorge makes up approximately 3 miles of the entire length of the river and stretches from the now defunct Nidd viaduct at Bilton in Harrogate to Grimbald Bridge, just south of Knaresborough.
Wikipedia: Link