Polgolla Barrage, Hydroelectric barrage in Kandy District, Sri Lanka

The Polgolla Barrage is a barrage across the Mahaweli River at Polgolla in Sri Lanka's Central Province. It holds the river at a constant level to feed an 8 km underground tunnel that carries water to the Ukuwela power station. At full capacity the Victoria reservoir submerges the downstream half of the barrage.

The Polgolla Barrage was built across the Mahaweli River at Polgolla to hold the river at a constant level, giving a uniform head at the intake of the underground tunnel to Ukuwela. The two 20 MW generators of the Ukuwela power station, fed by that 8 km trans-basin tunnel, were commissioned in July 1976.

About 50 m upstream of the barrage lies Paranaganthota, a historical river crossing on the Mahaweli. The reservoir created by the barrage also supplies the Greater Kandy Water Treatment Plant at Katugasthota, which provides drinking water to Kandy.

The barrage sits at the upstream edge of the Victoria reservoir, and its downstream side is partly submerged when the reservoir fills. The Polgolla Reservoir Waterdrome operates a short distance upstream, and the Paranaganthota river crossing lies about 50 m upstream of the barrage.

The barrage sits at the upstream edge of the Victoria reservoir, so when the reservoir fills, half of the barrage's downstream side is submerged. Its inundation also reaches the downstream edge of the Warathenna–Hakkinda Environmental Protection Area.