Lake Lonsdale

Updated as of 2:59 PM 13 January 2021

Lake Lonsdale is a large, shallow reservoir located on the Mt William Creek. It has a very large catchment area. The Mt William Creek catchment is not reliable during times of drought but can be a substantial producer of water during wetter years.

Lake Lonsdale was originally developed to supply the Wimmera-Mallee Domestic and Stock channel system, however its role has changed considerably following completion of the Wimmera Mallee Pipeline. Lonsdale continues to play a significant role in the overall water supply system; is a key source of water for the environment; and is highly valued for its recreational use.

General Information

​The lake is seen as a key recreation facility for the residents around Stawell.
Toilet facilities are available.
Dogs are permitted at lake.

Recreational Activities

​Swimming, water skiing and jet skis are permitted.

Duck hunting has been closed on Lake Lonsdale for the 2020 duck season due to the presence of a large number of threatened Blue-billed Duck.

Camping is not permitted until further notice.

Current Operating Status

Current Level 184.290 m AHD
Current Volume 6,280 ML
Percent Full 12%
Current Inflows -490 ML/week
24 hour Rainfall 0 mmCummulative Inflows Graph
Current Releases 0 ML/day
Current Spills 0 ML/day
Current Airspace 47,020 ML


  • Levels have fallen since last report.
  • Inflows to the reservoir have decreased since last report.
  • The reservoir is not currently spilling.


Full Supply Level 187.62 m AHD
Full Supply Volume 65,480 ML
Maximum Operating Level (MOL) 187.12 m AHD
Maximum Operating Volume 53,300 ML
Spillway Volume 187.12 m AHD
Spillway Length 53,300 m
Secondary Spillway Length 440 m
Secondary Spillway Capacity 149,470 ML/day
Outlet Capacity 600 ML/day
Catchment Area 1015 km2
Surface Area When Full 23.4 km2
Major Tributary Mt William Creek and Fyans Creek
Average Annual Inflow 52,000 ML/year
Maximum Depth 4.5 m
Year Constructed 1903
AHD = Australian Height Datum, expressed in metres above mean sea level
ML = Megalitres