Tarago Reservoir supplies water to Melbourne’s south-eastern suburbs, typically spanning Dromana to Garfield, as well as the Mornington Peninsula and towns in the Westernport region.
The reservoir was disconnected from Melbourne’s water supply network for many years due to water quality issues. It was reconnected in 2009, at the end of the Millennium Drought, following the completion of the Tarago Water Treatment Plant.
Key facts
The dam at Tarago Reservoir is constructed from rockfill with a clay core. It was completed in 1969 and enlarged in 1971.
- Catchment area: 11,400 hectares
- Surface area: 360 hectares
- Total capacity: 37,580 megalitres
- Dam height: 34 metres
- Dam length: 300 metres
Rainfall over the years
View highlights from our historical rainfall data for Tarago Reservoir, including annual rainfall, monthly averages, and the wettest and driest years by month.
Live rainfall and water storage data
Get the latest information on each of our 10 major reservoirs, including daily water storage levels and hourly rainfall and river level data.
Annual rainfall at Tarago (1971-2021)
Monthly rainfall records (mm)
Last updated: January 2022
| Month | Wettest | Driest | Average |
|---|---|---|---|
| January | 123.8 (1991) | 3.4 (1990) | 63.0 |
| February | 237.8 (2011) | 3.1 (1991) | 56.1 |
| March | 137.9 (1973) | 12.8 (1972) | 62.9 |
| April | 162.2 (2020) | 21.2 (1993) | 75.9 |
| May | 151.6 (2000) | 15.4 (2009) | 73.8 |
| June | 163.6 (2021) | 14.6 (2006) | 77.2 |
| July | 147.8 (1977) | 28.8 (1976) | 78.6 |
| August | 183.0 (2019) | 24.8 (1998) | 92.5 |
| September | 233.6 (1992) | 36.0 (2001) | 103.1 |
| October | 213.0 (1989) | 21.4 (2015) | 104.1 |
| November | 167.0 (1971) | 29.4 (1982) | 91.9 |
| December | 207.2 (1985) | 7.7 (1972) | 80.8 |
| Annual total | 1277.4 (2011) | 667.6 (1997) |
959.9 |
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