Drive in off the Head Road above Kilkeel, pay your £5 at the gate, and the road drops you into one of the most extraordinary places in the Mournes. The valley opens out ahead and there it is — the great stone dam, a curved wall of granite with its little tower, holding back a reservoir so still on a calm day that the mountains double themselves on the water. This is the water that fills the taps across Belfast and County Down, and standing at the foot of it you feel the scale of what people built up here.
Look up and the Mourne Wall runs the skyline. It's a dry-stone wall — NI Water say it climbs over fifteen summits and runs more than twenty miles around the whole catchment, built stone by stone in the early 1900s to keep the water clean. It's a jaw-dropper of a thing, and it turns every peak around you into part of one great enclosure.
Then you walk. There's a gentle nature trail along the old Kilkeel River and railway line, an easy loop past the dam and the memorials, and for stronger legs the trails climb up into proper Mourne upland. The showpiece is the long walk up the tarmac road to Ben Crom — a higher reservoir tucked deeper in the mountains, wilder and quieter — and when it's running there's a shuttle bus that saves the legs and carries you up. Back at the entrance there's a café and a visitor centre in the old bungalows, a playpark for the little ones, and picnic tables with a view worth lingering over. It's the kind of day the whole family finishes glad they came — the sort of place that reminds you what an afternoon in the mountains is for.
Plan your visit
Can I just turn up? Yes — drive in and pay at the gate.
No booking needed. You drive in off the Head Road and pay at the entrance — £5 per car is the usual charge (coaches, motorbikes and walkers pay different rates; confirm the current prices on the day). The park is open daily with the gates set to seasonal hours — longer in summer, shorter in winter — so check the NI Water page before an early start or a late finish. The car park holds around 120 cars on a first-come basis, and it can fill on a fine weekend, so an earlier arrival pays off.
CaféToiletsVisitor centrePicnic areas & playparkDogs on leads
Good to check first:
The park reopened after storm and wildfire damage in the Mournes, and NI Water say some trails may still be closed with fencing and signage in places — follow the barriers, and check the NI Water Silent Valley page for the current picture before you set off. The Ben Crom shuttle runs seasonally (weekends and holidays, weather permitting), so confirm it's running if that's your plan.
Before you set off
What to wear & bring
🥾Proper shoes or walking bootsThe paths near the centre are surfaced, but the longer trails climb and get rough and stony underfoot.
🧥A warm layer and a coatYou're up in the mountains — it's cooler and breezier than the coast, and the weather changes fast. Even a walk in the mist here is atmospheric.
🧺A picnicThere are tables with a view and a café for hot drinks — bring lunch and make an afternoon of it.
💧Water for the longer walksIf you're heading up towards Ben Crom or the higher trails, take a drink for the climb.
Good to know
Everything before you go
Cost
A charge is payable at the entrance — around £5 per car is the usual rate, with different rates for coaches, minibuses, motorbikes, cyclists and walkers on foot. Confirm the current prices on the day.
Season & hours
Open daily, with gate hours set by season — longer opening through the summer, shorter in winter. Check the NI Water Silent Valley page for the current times before an early or late visit.
The walks
An easy nature trail along the old Kilkeel River and railway line; a level loop past the dam, reservoir and memorials; and steeper mountain and challenge trails climbing into Mourne upland. The big one is the long walk up the road to Ben Crom reservoir, deeper in the mountains.
Ben Crom shuttle
A shuttle bus runs between the Silent Valley car park and Ben Crom on a seasonal basis — weekends and holiday periods, weather permitting. Confirm it's running before you rely on it.
The Mourne Wall
The famous dry-stone wall runs the surrounding peaks. NI Water say it stretches more than twenty miles over fifteen summits, built in the early 1900s to protect the water catchment.
Food
A café at the entrance for hot drinks and a bite. Picnic areas are dotted about too, with mountain views.
Toilets
Toilets at the car park and visitor centre.
Dogs
Welcome, but must be kept on a lead — it's a working water catchment with the odd sheep about.
Getting around
The paths and trails near the visitor centre are surfaced and gentler; the longer mountain trails and the Ben Crom road are rougher and climb, so pick the trail to suit the group.
How long
Half a day is about right — longer if you take the walk up to Ben Crom and back.
Questions
Before you go
Is there a charge to get in?
Yes — you pay at the entrance, and it's around £5 per car (coaches, motorbikes, cyclists and walkers pay different rates). It's best to confirm the current price on the day.
Do I need to book?
No — just drive in and pay at the gate. The car park holds about 120 cars on a first-come basis, so arrive earlier on a sunny weekend.
What's the Ben Crom shuttle bus?
It's a bus that carries you from the Silent Valley car park up the mountain road to the higher Ben Crom reservoir, saving the long walk. It runs seasonally — weekends and holidays, weather permitting — so check it's operating before you count on it.
Can I bring the dog?
Yes — dogs are welcome, but they must be kept on a lead. It's a water catchment area with sheep grazing about.
Is it suitable for a pram or wheelchair?
The paths near the visitor centre and car park are surfaced and gentle enough for a buggy. The longer mountain trails and the road up to Ben Crom are rougher and climb, so pick the trail to suit.
What if the weather closes in?
The mountains are atmospheric in mist and there's real drama to a moody day up here — but do check the forecast for the higher trails, dress warm, and keep the shorter loops in mind if the cloud comes down.
Getting there
Head Road, Kilkeel, Newry, County Down, BT34 4HU — up off the Head Road in the mountains north-west of Kilkeel, with parking on site.
Early last century Belfast and County Down were growing faster than their water could keep up. The answer was up here in the Mournes: dam the Kilkeel River in this deep, sheltered valley and pipe the mountain water down to the taps. The Silent Valley dam was built through the 1920s and early 1930s — an immense granite wall holding back a reservoir that still supplies much of Belfast and Co. Down today.
To keep the gathered water clean, the whole catchment was ringed by the Mourne Wall — a dry-stone wall carried by hand over the summits, built, NI Water say, in the years before the dam itself. The result is one of the great feats of the Irish landscape: a working piece of engineering that also happens to be one of the most beautiful spots in the mountains. Come for the walk and the water, and you leave with a bit more wonder than you arrived with.