The Castlereigh Dam (also spelled Castlereagh) is a gravity dam built across the Kehelgamu Oya, a major tributary to the Kelani River, approximately 3 km (1.9 mi) south-west of Hatton, in the Central Province of Sri Lanka.

Reservoir and power station

The dam creates the iconic Castlereigh Reservoir, which is almost entirely maintained by the inflow of water from the Kehalgamu Oya. Water from the reservoir is diverted to the Wimalasurendra Power Station, located approximately 12 km (7.5 mi) downstream at 06°54′31″N 80°31′30″E / 6.90861°N 80.52500°E / 6.90861; 80.52500 (Wimalasurendra Hydroelectric Power Station), near Norton Bridge. The power station discharges the water into the Norton Reservoir, created by the Norton Dam, located at the same site.

The power station consists of two 25-megawatt units, totalling the plant capacity to 50 MW. Both units were commissioned in January 1965.

Water airport

The Castlereigh Reservoir is also home to the Castlereigh Water Airport, registered under the IATA code NUF.

See also

• List of dams and reservoirs in Sri Lanka
• List of power stations in Sri Lanka