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The Oberon Dam is a major dam on the Fish River (formerly, Fish River Creek), located approximately 3 kilometres (1.9 mi) upstream, south-east of Oberon. The original intent of the works was to supply water to the National Oil Proprietary Ltd's refinery at Glen Davis in the western coal fields, factories at Lithgow, and supporting populations. Water from Oberon Dam feeds the Fish River Water Supply, which is a unique regional water supply scheme and is the only scheme in eastern Australia to transfer western flowing water to areas east of the Great Dividing Range.

The reservoir is regularly stocked with brown and rainbow trout and can be fished throughout the year from the water's edge. On the reservoir's northern shore toilets and picnic facilities are available.