The dam was completed in 1982 and has a rock-fill embankment 73 metres (240 ft) high.

Sulby Reservoir is also about 1.5 miles (2.4 km) west of the summit of Snaefell, the island's highest peak.

[2] The reservoir supplies the northern half of the island, St Johns, Peel, Kirk Michael, Ballaugh, Andreas, Bride, Ramsey and Laxey.

Water can also be pumped to the West Baldwin Reservoir which supplies Douglas and the southern half of the island.

The power station is also fed by another, smaller reservoir, Block Eary.