Overview
Spelga Reservoir sits high in the Mourne Mountains of County Down, perched at over 1,200 ft above sea level. The man-made lake was created to help secure the water supply for the wider region, impounding the headwaters that eventually feed into the River Bann catchment. Today, it serves as a quiet, high-altitude retreat where civil engineering meets wild landscape. The reservoir is set in a broad valley surrounded by iconic peaks like Slievenamuck and Pigeon Rock. From the main car park, visitors are greeted by a sweeping 360-degree panorama of glassy water framed by the rugged Mourne range. The area falls within an Area of Outstanding Natural Beauty, drawing photographers, cyclists, and walkers throughout the year.
The Gravity Hill Illusion
Just a short distance south of the dam lies a well-known optical illusion locally referred to as the magic hill. The surrounding terrain distorts your sense of level, making a gentle downhill slope appear to be a steep incline. If you place a car in neutral and release the brake, the vehicle will seem to roll uphill against gravity. The effect is purely visual, caused by the way the landscape frames the road, but it remains a favourite stop for visitors. Many draw comparisons to Scotland’s famous Electric Brae, though Spelga’s version is quieter and set against a dramatic mountain backdrop. It’s a quick, free diversion that adds a touch of playful mystery to any visit.
Walking & Exploring
The reservoir is a popular base for exploring the wider Mournes. The main car park on the north side serves as the starting point for several routes. A gentle lakeshore stroll offers a flat, accessible walk that showcases the water’s reflective surface and the surrounding hills. For those seeking a longer challenge, the Spelga Dam loop is a demanding circuit that climbs over nearby peaks like Slievenamiskan and Cock Mountain before descending back to the valley. The route rewards effort with uninterrupted views across the reservoir and the distant coastline.
Wildlife is present but understated. The lake supports wild pike and trout, and birdwatchers often spot waterfowl and raptors circling the high slopes. During prolonged dry spells, the water level can drop significantly, occasionally exposing the original road and bridge that were submerged when the reservoir was filled. When this happens, the exposed roadway becomes a temporary walking path, offering a fascinating glimpse into the landscape’s past.
Getting There & Practical Info
Spelga Reservoir is free to visit and open year-round. The main north-side car park provides the most convenient access, with designated accessible spaces and nearby toilets. The south-side car park is smaller and offers a closer view of the dam structure, often providing a quieter experience during peak summer months.
By car: From Newcastle, follow the A2 south, turn onto Quarter Road, and continue onto the High Mournes Scenic Loop. After passing Silent Valley, turn left onto the Kilkeel Road (B27) and follow the signs to the reservoir car park. The drive is highly scenic, winding past Fofanny Dam, Tollymore Forest Park, and the iconic peaks of Slieve Donard and Slieve Commedagh. From Belfast, take the M1 south to the Sprucefield exit, follow the A1 to Newry, and join the B8 toward Hilltown before switching to the B27 for the final ascent.
Public transport: The area is not served by regular bus routes, but the seasonal Mourne Shuttle Service operates pre-booked transfers from Newcastle and surrounding towns to key mountain viewpoints, including Spelga Dam. Visitors should check the current seasonal timetable and book in advance, as spaces fill quickly during summer weekends.
Visitor tips:
- Wear sturdy footwear for the valley walks, as paths can be uneven and muddy after rain.
- Mobile phone signal is patchy in the valley; download offline maps before heading out.
- There are no shops or cafés on site, so bring your own food and water. Picnic tables are available near the north car park.
- Dogs are welcome but must be kept under close control, as the area is used for water supply and local livestock grazing.
- For further high-altitude walking, Ben Crom Mountain and Dam lies a short drive away, while Castlewellan Forest Park offers a contrasting lowland woodland experience.
Spelga Reservoir works best as a quiet pause on a wider Mourne Mountains day trip. Pair a morning coffee at the lakeside overlook with a short walk to the gravity hill, then use the reservoir as a starting point for a longer mountain ascent or a scenic drive down to the coast. The exposed old road during dry summers offers a rare chance to walk where the valley floor once stood, a quiet reminder of how the landscape was reshaped to meet the region’s needs.