Lake Nisramont, lake in Belgium

Lake Nisramont is a 47-hectare reservoir in the Belgian Ardennes, held back by a 116-metre-long, 16-metre-high dam built where the Western and Eastern Ourthe join to form the Ourthe. The grey concrete dam has a fish ladder and a hydroelectric plant. The lake lies near Nisramont in the commune of La Roche-en-Ardenne, province of Luxembourg.

The Nisramont dam was built in the 1950s where the Western Ourthe (53 km) and Eastern Ourthe (46 km) join to form the Ourthe, at the Engreux site. The 116 m long, 16 m high structure holds back 3 million m³ of water and includes fish ladders and a hydroelectric plant. A water treatment station stands beside it.

The lake lies at Engreux, where the Western Ourthe (53 km) and Eastern Ourthe (46 km) join to form the Ourthe; each of the three branches occupies a comparable share of the water. Anglers and canoeists use the reservoir, and the stretch downstream to La Roche-en-Ardenne is called Haute-Ourthe.

The site is accessible year-round, and parking is available near the Engreux sports center in Houffalize. Hiking trails are well signed and can be followed in either direction, so you can adjust the walk to your own pace and energy.

Along the trail stands a sculpture called Avolare, shaped like two fish fins, placed at a viewpoint that looks directly over the spot where the two branches of the Ourthe come together. A small bivouac area nearby allows visitors to spend the night outdoors without a full campsite setup.