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Colsterdale towers
The Colsterdale towers are a set of sighting towers in and around Colsterdale, North Yorkshire, England.
These sighting towers were used to conduct surveys during the construction of Leighton reservoir and Roundhill reservoir, other proposed reservoirs and accompanying pipelines.〔http://neiljacklin.com/cms/route/uk/north-yorkshire/leighton-reservoir/white-lodge-crags/ouster-bank/lofthouse-moor/pott-moor〕
Visible from Roundhill Reservoir and Leighton Reservoir above Arnagill Crags is a stone sighting tower built over an aqueduct near a water pumping station. The similar Carle Tower is situated 3 km southeast just above Wandley Gill, Carlesmoor Sighting Tower is a further 2 km east and another sighting tower to the north is long since gone having been constructed of wood. The Greygarth Monument is also in the area, commemorating Queen Victoria's Diamond Jubilee in 1897.
==Erection==
The sighting towers were erected to conduct surveys (the steep-sided valley of Dallowgill was once a proposed reservoir site) and as references for construction of the pipeline over hill and dale toward Harrogate. The pipe begins at the bottom of a small catchments reservoir above Spout Gill Farm and flows to Roundhill Reservoir, where it meets with the dam overflow pipe that runs to Carlesmoor and empties into the River Laver.
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