Blowering Dam

Blowering Dam
Name	Blowering Dam
Location	Tumut, New South Wales, Australia
Country	Australia
Status	Operational
Owner	Snowy Mountains Hydro-electric Authority
Dam type	Rockfill embankment
Dam height	112 m
Dam length	1,450 m
Reservoir name	Blowering Reservoir
Reservoir capacity total	1,628,000 ML
Plant operator	Snowy Hydro
Plant capacity	80 MW
Opening	1968

Blowering Dam Blowering Dam is a major rockfill embankment dam on the Tumut River near Tumut, New South Wales, Australia, forming Blowering Reservoir. The dam was completed in the late 1960s as part of regional water infrastructure and hydroelectric development linked to the Snowy Mountains Scheme and Australian Capital Territory water initiatives. It supports irrigation, flood mitigation, water supply and hydroelectricity for the Riverina and the Murrumbidgee River catchment. The site is notable for its scale, reservoir capacity, and integration with downstream river regulation works.

Location and Overview

Blowering Dam is located on the Tumut River upstream of Tumut, within the Snowy Valleys Council area of New South Wales. The reservoir lies within the broader Murrumbidgee River basin and directly influences flows to the Murrumbidgee Irrigation Area and the townships of Gundagai and Wagga Wagga. The dam is sited adjacent to major transport routes linking Canberra and Adelaide corridors and is within driving distance of Cooma and Gundagai Shire. Its catchment receives alpine runoff from ranges associated with the Australian Alps and is connected administratively to agencies such as the New South Wales Department of Planning and Environment and utility operators including Snowy Hydro.

Construction and Design

Constructed between the mid-1960s and 1968, the dam employed engineering practices contemporary to the Snowy Mountains Scheme. The structure is a zoned rockfill embankment with a central impervious core and synthetic seepage controls, reflecting techniques used in other major Australian dams such as works at Eucumbene Reservoir and Guthega Power Station infrastructure. Main design contractors coordinated with technical bodies including the Engineers Australia membership and drew on geotechnical data from the Bureau of Meteorology hydrology reports. The dam crest, spillway works and outlet structures were shaped to accommodate extreme flood events modeled from historic floods like those recorded at Gundagai flood events. Construction required civil, hydraulic and electrical coordination comparable to projects managed by the Snowy Mountains Hydro-electric Authority and consulting firms linked to the Commonwealth Scientific and Industrial Research Organisation.

Hydrology and Operations

Blowering Reservoir regulates flows on the Tumut River, providing storage for seasonal inflows originating in the Australian Alps snowmelt and rainfall-fed tributaries. Operating regimes are coordinated with downstream storages and regulators on the Murrumbidgee River system and are subject to water-sharing frameworks overseen by the Murray–Darling Basin Authority and state water agencies such as the New South Wales Water management divisions. The reservoir’s operation considers flood mitigation strategies informed by historical high-flow events documented in records maintained by the Bureau of Meteorology and water allocation planning aligned with the Murray Darling Basin Plan. Monitoring and infrastructure maintenance involve partnerships with entities including Snowy Hydro operations teams and regional emergency services like the NSW Rural Fire Service during drought and extreme weather.

Power Generation and Facilities

A hydroelectric power station associated with the dam harnesses regulated releases to generate renewable electricity. The power facility contributes to regional supply and operates under the commercial manager Snowy Hydro, integrating with transmission assets connected to the National Electricity Market and regional substations operated by networks such as TransGrid. Turbine selection, generator maintenance and plant upgrades have been influenced by national energy policy debates and interactions with the Australian Energy Market Operator for dispatch scheduling. The plant’s output supports local industrial loads and grid stability while participating in demand-response arrangements alongside other pumped and conventional hydro units within the Snowy portfolio.

Environmental and Social Impacts

Creation of the reservoir transformed riverine and riparian habitats, prompting ecological responses among native species documented by researchers at institutions like the Australian National University and the University of New South Wales. Impacts included modification of fish migration patterns affecting species recorded in the Murrumbidgee River such as native freshwater fish monitored by the NSW Department of Primary Industries. Salinity, groundwater interactions and wetland connectivity have been topics of management plans developed with stakeholders including the Murray–Darling Basin Authority and local councils. Social effects included changes to land use for communities in Tumut and the Riverina, adjustments to irrigation allocations under statutes influenced by the Water Act 2007 (Cth), and engagement with regional Aboriginal communities with ancestral ties to the Wiradjuri people and other Traditional Owner groups.

Recreation and Tourism

Blowering Reservoir is a regional destination for recreational boating, angling, water skiing and camping, attracting visitors from centres such as Canberra, Wagga Wagga and Sydney. Facilities near the reservoir include boat ramps, picnic areas and caravan parks managed in coordination with local tourism bodies like Destination NSW and the Snowy Valleys Council tourism units. Seasonal events, recreational fishing competitions and outdoor activities connect to broader tourism circuits through the Snowy Mountains and Riverina visitor itineraries, supporting hospitality operators and regional visitor economies.

Category:Dams in New South Wales Category:Hydroelectric power stations in New South Wales