Warner Lake is located on the Pangman Tract (Concession 14, Lots 12-14 of South Frontenac Township, Frontenac County). Mean depth = 2.9 m; maximum depth = 6.4 m; surface area = 9.2 ha, shoreline = 2058.4 m. Warner Lake has minor inflows associated with its surrounding wetlands. The lake's outflow is through a beaver pond and a series of above and below ground creeks, eventually draining into Lake Opinicon and the Rideau Canal.