Geehi Dam, Rockfill embankment dam in the Snowy Mountains, New South Wales, Australia

Geehi Dam is a 91-metre-high, 265-metre-long rockfill embankment dam with an earth core across the Geehi River in the Snowy Mountains of New South Wales. Completed in 1966, it impounds Geehi Reservoir, which covers 70 hectares and holds 21,093,000 cubic metres at full capacity. Its uncontrolled bell-mouth spillway is 32 metres in diameter.

The structure was completed in the 1960s as part of a large-scale water management program developed over several decades. It was built to control river flow and support electricity generation across the wider mountain region.

Geehi Dam is one of sixteen major dams of the Snowy Mountains Scheme, built between 1949 and 1974 and now run by Snowy Hydro. Its water arrives through the Snowy-Geehi tunnel from Island Bend Pondage, then drops via the Murray 1 pressure tunnel to Murray 1 power station, rated at 950 megawatts. The tunnel outlet and power-station intake share a structure reached by a suspended footbridge.

Geehi Dam stands on the Geehi River about 19 km southeast of Khancoban in the Snowy Valleys area; the nearest larger town is Khancoban, roughly 19 km northwest. The outlet of the Snowy-Geehi tunnel, shared with the intake of the Murray 1 pressure tunnel, can be reached by a suspended footbridge. The catchment around the reservoir is sparsely populated, so check road conditions before setting out.

The uncontrolled bell-mouth spillway is a concrete funnel 32 metres across, able to pass up to 1,534 cubic metres of water per second. The outlet of the Snowy-Geehi tunnel shares its structure with the intake of the Murray 1 pressure tunnel, and a suspended footbridge gives access to it.