Hydraulic Lake, also known as McCulloch Lake or McCulloch Reservoir, is a man-made lake of approximately 260 hectares situated about 35 kilometres southeast of Kelowna, British Columbia.

It sits at roughly 1,260 metres elevation and can be reached by turning off Highway 33 onto McCulloch Road. The lake lies near the Kettle Valley Railway section of the Trans Canada Trail.

The lake is a noted rainbow trout fishery, with fish occasionally reaching 5 pounds. Trolling small lures and flatfish are popular techniques, though fly fishing also produces results. A motor restriction of 7. 5 kW applies.

A BC Forest Service recreation site at the north end of the lake offers campsites and a boat launch.