Causeway Coast Holiday

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Wider Northern Ireland

Explore Historical Silent Valley and the Mourne Mountains

Fact-checked 21 August 2026

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Good to know before you go

Parking
5 pounds per car at the visitor centre car park, rarely full except peak summer weekends and bank holidays.
Toilets
Accessible toilets and baby-changing facilities beside the visitor centre; refreshments available during summer and public holidays.
Dogs
Permitted on a lead; guide dogs welcome throughout, but not inside the cafe. Little shade or water access for dogs, so bring your own.
Accessibility
The main reservoir loop is a fully surfaced, gentle walk suitable for wheelchairs, with disabled parking and toilets at the visitor centre.

The Silent Valley Reservoir, in the Mourne Mountains a short drive from Kilkeel, County Down, has supplied Belfast’s water since the early 20th century and is now also a popular walking destination in its own right.

History

As Belfast’s industries grew through the 19th century, engineer Luke Livingstone Macassey identified the Mourne Mountains as a future water source for the city. The resulting Mourne water scheme unfolded in stages: the Mourne Wall (1904–1922), a 22-mile (35km) dry-stone wall crossing 15 Mourne summits, enclosed roughly 9,000 acres of high mountain land; the Silent Valley Reservoir itself (1922–1933) provided storage of around 3,000 million gallons; the Binnian Tunnel (1949–1958), a 4km tunnel through Slieve Binnian, diverted water from the Annalong River; and the Ben Crom Dam (1954–1958), upstream of Silent Valley, completed the scheme. A memorial at the site commemorates workers who died during construction.

Walking Routes

Six waymarked routes run from the main car park, ranging from an easy 1.1-mile Nature Trail (following the old railway line used to move men and materials during construction) to the more demanding six-mile Ben Crom Dam walk and the challenging Mountain Trail. The Heritage Walk passes the “Mourne Hand” sculpture, a duck pond, and the ruins of Watertown House, once accommodation for construction workers, alongside its memorial to those who died building the scheme.

Facilities

The site includes a café, a children’s play park near the duck pond, and picnic areas.

Opening hours are seasonal: 10am-6pm April to October, 10am-4pm November to March.

Admission (per vehicle/person, at the entrance - cash or contactless):

Annual passes are also available for regular visitors: £20 for a car, £50 for a minibus (up to 16 passengers), covering entry during normal opening hours for a full year.

Car park capacity is limited to 120 spaces, first-come-first-served - no access once the site reaches capacity, so arriving early is worth it on busy days.

For further enquiries, contact NI Water’s Waterline on 03457 440088.

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