Leslie Dam is approximately 12 km west of Warwick and is located on Sandy Creek. Leslie Dam has a catchment area of 603 km2 and is owned and managed by Sunwater. Council holds a high priority water allocation from Leslie Dam to supply drinking water for Warwick, Allora, and Yangan.
Leslie Dam is the main water storage for the Upper Condamine Scheme, which supplies irrigation and urban water supply to users in Warwick and Cecil Plains. The scheme supplies Warwick's town water as well as that of Cecil Plains, but it also underpins irrigation in the region, serving about 100 bulk customers that use irrigation to grow crops. All water releases for irrigation are managed by Sunwater in accordance with the user agreements between Sunwater and licence holders.
Releases for irrigation cease once the dam storage is less than or equal to 460.35 m AHD below full supply level, which is when the dam storage sits at 14,960 ML or 14.08% full. The remaining supply is reserved exclusively for town water supply for Southern Downs Regional Council.
Leslie Dam was surveyed in 2019 and it was determined to have no material impact from silt levels.