Lake Lonsdale

Updated as of 1:39 PM 12 June 2019

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.
Camping on the northern foreshore of the lake is popular.
Toilet facilities are available.
Dogs are permitted at lake.

Recreational Activities

​Swimming, water skiing and jet skis are permitted.
Camping is permitted in designated camping areas only.
Shooting of ducks is permitted during duck season, subject to seasonal restrictions.
Camp fires are permitted in designated fireplaces.

Current Operating Status

Current Level 184.420 m AHD
Current Volume 7,790 ML
Percent Full 15%
Current Inflows 370 ML/week
24 hour Rainfall 13 mmCummulative Inflows Graph
Current Releases 0 ML/day
Current Spills 0 ML/day
Current Airspace 45,510 ML


  • Levels have risen since last report.
  • Inflows to the reservoir have increased 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