Located on the Gállego River, the Ardisa reservoir is shared by the municipalities of Ardisa and Biscarrués. However, both most of the layout of the dam and all the buildings reviewed are located in the municipality of Biscarrués, which is why they have been included in the catalog of this municipality.
The reservoir has an area of 2100 km2, with a total capacity of 5 Hm3 and a useful capacity of 3 Hm3.
The dam is made of cyclopean concrete. It presents the type of gravity dam, with a height of 31.14 m and a crest length of 450 m. It has a curved layout and a front arranged in a stepped slope.
On the right bank there is a large trapezoidal tank delimited by concrete walls (called a "surface spillway" in the reservoir project) which, through a four-span spillway, connects to a long drainage channel arranged in slope that flows into the river Gállego.
The set also consists of several buildings, all of them located on the left bank of the river: the gate house, through which the discharge to the canal that leads water to the Sotonera reservoir is regulated, the dam guard's house , a warehouse and a water tank.