Yan Yean Reservoir

Yan Yean Reservoir supplies the northern and central suburbs of Melbourne. The dam is an earthfill embankment and was completed in 1857.

Yan Yean aerial photograph

Rainfall figures for Yan Yean Reservoir

Storage and rainfall data

Use our interactive web application to view current storage levels and catchment rainfall for Yan Yean Reservoir


Key rainfall facts (mm)

 

​Month Wettest​ Driest​ Average​
​January 144.1 (1872) 0.0 (1878) 44.7
February​ 221.0 (1911) 0.0 (1991) 46.2
March​ 193.3 (1970) 2.5 (1948) 50.0
April​ 215.1 (1901) 0.0 (1923) 56.9
May​ 147.8 (1942) 2.3 (1934) 56.4
June​ 166.8 (1977) 11.7 (1972) 52.3
July​ 146.8 (1891) 15.4 (1979) 50.8
August​ 151.1 (1939) 10.9 (1928) 58.4
September​ 231.9 (1916) 9.9 (1938) 62.3
October​ 195.6 (1934) 7.4 (1914) 67.8
November​ 207.2 (1988) 5.6 (1967) 61.9
December​ 211.8 (1930) 2.8 (1972) 56.7
Total rainfall​ 1050.9 (1872) 370.6 (1945) 664.3


Historical rainfall data (1856-2016)

Location of Yan Yean Reservoir 

​History of Yan Yean

Yan Yean was Melbourne’s first engineered water supply system. It helped transform Melbourne into a modern metropolis after very small beginnings as a settlement along the Yarra River.

Key facts

  • Catchment area:
    2,250 hectares (off stream storage)
  • Surface area:
    560 hectares
  • Total capacity:
    30,266 megalitres
  • Dam height:
    10 metres
  • Dam length:
    963 metres

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