It is named after Nisramont, a village near the lake. The dam has a length of 116 m and is 16 m high. The volume of water is 3,000,000 m and the area of the lake is 0.47 km. The dam has fish ladders and a hydro-electric power station. The dam was erected at the point where the Western Ourthe (Ourthe Occidentale) and Eastern Ourthe (Ourthe Orientale) merge to form the Ourthe. The lake is a tourist attraction, with water sports, including canoeing and fishing.
