These sighting towers were used to conduct surveys during the construction of Leighton reservoir and Roundhill reservoir, other proposed reservoirs and accompanying pipelines.[1]
Visible from Roundhill Reservoir and Leighton Reservoir above Arnagill Crags is a stone sighting tower built over an aqueduct near a water pumping station.[2] The similar Carle Tower is situated 1.9 miles (3 km) southeast just above Wandley Gill,[3] Carlesmoor Sighting Tower is a further 1.2 miles (2 km) east[4] and another sighting tower to the north is long since gone having been constructed of wood. The Greygarth Monument is also in the area,[5] 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.
