Keep track of reservoir levels, see how much water is being used and view our annual water outlooks here.
In the area previously serviced by Western Water, Greater Western Water has two main water storages, Rosslynne Reservoir and Merrimu Reservoir, both of which are managed by Southern Rural Water. These reservoirs supply the Melton and Bacchus Marsh (Merrimu) and Macedon Ranges and Sunbury (Rosslynne) districts.
Greater Western Water manages a number of smaller reservoirs in and around the Macedon Ranges. The region is also connected to the Melbourne water supply which can be used when local supplies are low.
Local reservoir levels
This graph displays combined water levels in local reservoirs. For individual reservoirs please click on the tabs below.
Average residential water use (litres per person per day for properties in the area previously serviced by Western Water)
Merrimu Reservoir is located between Bacchus Marsh and Toolern Vale. It is managed by Southern Rural Water.
Water from the reservoir is treated by Greater Western Water and can be supplied to customers in the Bacchus Marsh and Melton areas. Southern Rural Water also provide water from the reservoir to the Werribee Irrigation District.
Merrimu Reservoir is also open for recreational use. For more information, visit the Southern Rural Water website.
Capacity: 32,516 ML
Rosslynne Reservoir is located near Gisborne. It is managed by Southern Rural Water.
Water from the reservoir is treated by Greater Western Water and can be supplied to customers in the Sunbury and Macedon Ranges area. Southern Rural Water also provide irrigation water from the reservoir to river diverters along the Maribyrnong River.
Rosslynne Reservoir is closed to the public. For more information, visit the Southern Rural Water website.
Capacity: 25,400 ML
Pykes Creek Reservoir
Pykes Creek Reservoir is located between Ballan and Myrniong. It is managed by Southern Rural Water.
Water from the reservoir is used by famers in the Bacchus Marsh and Werribee Irrigation Districts. Greater Western Water also treats water from the reservoir and supplies it to residents in Myrniong.
Pykes Creek Reservoir is open for recreational use. For more information, visit the Southern Rural Water website.
Capacity: 22,119 ML
Garden Hut Reservoir & Lancefield Service Basin (Lancefield)
Capacity: 112 ML
Campaspe Reservoir, Graham Brock Reservoir and Reservoir C (Woodend)
Capacity: 361 ML
Kerrie Reservoir and Glenfern Basin (Romsey)
Capacity: 341.5 ML
Surcharging and pre-release policy
Greater Western Water’s surcharge and pre-release infrastructure associated with its water storage dams and reservoirs is very limited, and as such Greater Western Water is not in a position to undertake any surcharge or pre-release prior to flood events.
Greater Western Water’s storages are equipped with spillways which allow flood waters to spill from the storage if it is at full capacity. Greater Western Water will monitor storages during and post flood events and will respond as required.
Annual Water Outlooks
Annual Water Outlooks include an update on the status of our water supply systems and forecast the expected performance for the year ahead.
See the Annual Water Outlook for Victoria.