Northumbrian Water is getting ready to work at Grassholme Reservoir in Teesdale, which will permanently reduce the reservoir capacity and the top water level and improve facilities for leisure visitors.
The work, part of a £12 million programme of upgrades at the site, will temporarily lower the water level by up to 4 metres in the reservoir to allow construction works to be completed, before being set at their new level.
The work to lower the levels will increase the resilience of the reservoir and help to protect the Victorian dam wall during extreme flooding.

The work planned for 2020, which is scheduled to run from March to December 2020, is part of ongoing investment in line with the site's most recent ten-yearly assessment by government inspectors.
The company has worked with statutory bodies and carried out a number of surveys and consultations, into developing the plans, which meet requirements outlined in the site's latest Government reservoir inspection.
Plans for further work, anticipated for 2021 to 2022, are currently being finalised and will be the subject of a planning application, which is expected to be submitted to Durham County Council in the Spring.
Leisure upgrades are also planned subject to planning and will include improved disabled facilities for fishing, a new beach for anglers on the south shore, and, for the first time, sailing and angling will be separated. Improvements will also be made to facilities currently used by the Teesdale Sailing and Watersports Club, with new boat launch and parking facilities.
The work complements other planned developments, including a planned observatory, which will help turn Grassholme Reservoir into a key multi-purpose leisure destination.
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