Vital work is about to begin to strengthen a 155-year-old underground tunnel at Ogden Reservoir.
Beginning this month, engineering experts will strengthen the 140-metre long tunnel, which runs underneath the embankment and was built in 1858.
Yorkshire Water bosses say work is needed to keep the tunnel strong and protect the pipe inside, which transports water to keep levels healthy at the downstream beck, which in turn feeds the nearby river.
Engineers will also strengthen the reservoir embankment with 3,500 tonnes of earth.
A local ecologist will help advise on the removal of about 12 trees to allow for the work, and will also install bat and bird boxes. The footpath around the reservoir will be unaffected by the work, but some other footpaths will be temporarily closed in the surrounding area.
Tim Dyke, project manager, said Yorkshire Water had written to local residents and signs would update visitors on the scheme’s progress. He said: “We take the safety of our reservoirs extremely seriously and this work is vital to ensure Ogden continues to effectively perform its primary role of topping up local water courses in times of need.
“We want to reassure visitors that their recreational fun should not in any way be impeded and we’ll work hard to complete the job as quickly as possible.”
Chris Sutcliffe, Calderdale Council’s area countryside officer, said: “This site is enormously popular with both human and wildlife visitors - only this year we had a yellow-browed warbler nip to us for a few days. I’m pleased to see Yorkshire Water improving the site and we hope their improvements will ensure people can continue to visit here for years to come.”
The work is part of a £60m investment by Yorkshire Water on reservoirs.