Silvan Reservoir, Reservoir in the Dandenong Ranges, Victoria, Australia

Silvan Reservoir is an earth-filled embankment dam 40 metres high and 650 metres long across Stoneyford Creek in the Dandenong Ranges, about 40 kilometres east of Melbourne. When full, the reservoir holds 40.58 gigalitres, is 43 metres deep and covers 334 hectares. A 2-megawatt mini-hydro station stands beside the dam wall.

A drought in 1914 pushed the Victorian government to find new water storage for Melbourne. The earth-fill dam across Stoneyford Creek was built between 1926 and 1931, and the reservoir opened on 7 July 1931. In 1983 cracks appeared in the dam wall; repairs finished in 1986 with a rock-fill face added downstream.

The reservoir's name comes from the district of Silvan, and the picnic ground in Silvan Reservoir Park is managed by Parks Victoria. The park was enlarged with a picnic area in 1983, the same year cracks appeared in the dam wall. Visitors today use the picnic ground and walking paths around the fenced catchment.

The reservoir is fenced off and closed to swimming, fishing and boating. The picnic ground at Silvan Reservoir Park is managed by Parks Victoria. The dam wall is 650 metres long and 40 metres high, with a rock-fill face added downstream between 1983 and 1986.

The reservoir's catchment covers only 9 square kilometres, so most of its water is piped in from the Upper Yarra, O'Shannassy and Thomson reservoirs. In 2008 a 2-megawatt mini-hydro station was built beside the dam wall, producing about 11 gigawatt-hours a year.