Cordeaux Dam

Remarkable Egyptian-style architecture






7.8 KM2

Please be advised, that currently the water is not suitable for drinking, and you are advised to bring your own water. WaterNSW apologises for any inconvenience.

Remarkable for its Egyptian inspired architecture, a visit to Cordeaux Dam is like stepping back in time. Massive Egyptian style stone gateways guard the entrance to the dam wall, and the leafy picnic grounds feature stands of tall pine trees and other reminders of past times. Cordeaux is one of four dams that make up the Upper Nepean water supply scheme south of Sydney on the Illawarra Plateau.

Lookout points

Upper picnic area

The southern end of the upper picnic area carpark provides elevated views of the lake.

Dam wall

From the upper picnic area, drive or walk along an avenue of Monterey Pines to the lower carpark near the dam wall, then walk across the wall for views of the lake upstream and river downstream.

HOURS - Entry is free

  • 10am to 5pm daily
  • 10am to 7pm on weekends and public holidays during DST
  • No entry 15 mins before close


  • Carry a first aid kit
  • Bring plenty of drinking water
  • Keep your distance from the wildlife
  • Check roads and weather forecasts

Learn more about safety at our sites.


Please phone 1800 061 069

In an emergency call 000

We’re the people taking care of the state’s water at the source – capturing, storing, delivering. Learn more about WaterNSW.


We hope you enjoy your visit, please check the Recreation Area map (PDF, 1593.02 KB)

If you are intending on bringing a large group (schools, community clubs, scouts, etc) please fill out this form.

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Children’s Playground

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Disabled toilets

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Drinking water

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Hot water

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Picnic Shelters

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Viewing areas

Things to do

Be photographed in Egypt!

Stand under one of the massive stone gateways at either end of the dam wall and have your photo taken. Your friends may think you've been on holidays in Egypt! The gates were inspired by the popularity of all things Egyptian following the discovery of King Tutankhamun's tomb in 1922. Construction of Cordeaux Dam started in 1918 and was completed in 1926.

Walk across the dam wall to the spillway

After your photo under the Egyptian style gateway, walk across the curved wall of the dam. It's longer and lower than the other Upper Nepean dam walls - 405 metres long but only 57 metres high. Pause halfway and admire the views of the lake upstream. Walk to the end for an impressive view of the spillway, framed through the Egyptian style archway.

Step back in time

Be on the lookout for reminders of the dam's glory days as a picnic spot in the 1930s and 1940s, when Upper Nepean dams competed for the most beautiful gardens. In the upper picnic area, look out for remnants of old garden layouts and a grotto between a large Monterey Pine and a very large Eucalypt. Enjoy the stands of mature pine trees and a crazy-paved stone path leading to a lower picnic area with a series of grassed terraces.

Visit the memorials

A plaque on the valve house on the dam wall pays tribute to Guy Chalmers-Clift, 37, the Resident Engineer in charge of the dam's construction. On 10 March 1924, Clift and Constable James Flynn, 27, a local police officer, were shot while taking a suspect to Appin Police Station after a bungled attempt to steal the Cordeaux payroll. The intoxicated prisoner, William Simpson, 34, was later captured at the Royal Hotel in Appin, and was charged with the two murders. He was hanged at Long Bay Gaol in December 1924.

A memorial to Jack Clark, who was the dam’s Resident Officer from 1964 to 1977, can also be found in the feature garden in the picnic grounds.

Relax with a picnic and soak up the views

Relax with family and friends in the landscaped grounds. Throw down a rug and enjoy a picnic - you're sitting on the site where the dam builders lived in the 1920s! Look for remnants of an old road, drains and a tennis court. Picnic facilities include electric barbecues, drinking water, toilets and a children's playground. Drive or walk along an avenue of Monterey Pines to the lower carpark and toilets near the dam wall. The wall and picnic area provide excellent views of the lake in its natural bushland setting.

Map and directions

Cordeaux Dam is about 94 kilometres drive from Sydney. From Sydney, take the Hume Highway (M31) south towards Canberra. Past Campbelltown, take the Wollongong/Picton turn-off. The Cordeaux Dam entrance is about 10 minutes on the right, and is signposted.


Restrictions are in place to protect our water supply and ensure that everyone has an enjoyable and safe visit - with penalties up to $44,000 applying:

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No smoking within 10 metres of children's playgrounds and four metres of shelters, toilets and public buildings

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No wood, charcoal or solid fuel barbecues. Penalties of up to $5,500 apply

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No access allowed to restricted and Special Areas

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Keep to vehicle speed limits and be aware of pedestrians

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No model aircraft or drones

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No dogs, horses or other pets

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No portable gas barbecues during total fire bans

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No fishing, boating or swimming

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No camping

Recreation Areas at WaterNSW dams will be closed on ALL Total Fire Ban days.

Facts and History

Located about 94 kilometres south of Sydney, Cordeaux was the second of the four dams constructed to collect water from the Illawarra Plateau. Created by damming the Cordeaux River, construction started in 1918 and was completed in 1926.

Find out more

Facts and History

Located about 94 kilometres south of Sydney, Cordeaux was the second of the four dams constructed to collect water from the Illawarra Plateau. Created by damming the Cordeaux River, construction started in 1918 and was completed in 1926.

Together with Cataract Dam, Cordeaux's main role today is to supply water to Camden, Campbelltown and Wollondilly council areas via the Macarthur water filtration plant.

Together, the Nepean, Avon, Cataract and Cordeaux dams also provide an additional supply of water for Sydney, via Pheasants Nest Weir, Broughtons Pass Weir and the Upper Canal.

Why the dam was built

The Upper Nepean catchment south of Sydney is in one of the highest rainfall zones on the mid-NSW coast, and the area's rivers, located in narrow gorges, provide ideal dam sites.

As early as 1888, two weirs were built on the Cataract and Nepean rivers to capture this rainfall as part of the Upper Nepean Scheme to help meet Sydney's growing needs. Tunnels, canals and aqueducts - known as the Upper Canal - diverted the water 64 kilometres to Prospect Reservoir.

The scheme provided only temporary relief, and the 1901 - 1902 drought brought Sydney perilously close to a complete water famine. After two Royal Commissions, authorities agreed that a dam be built on Cataract River. The successive building of Cataract, Cordeaux, Avon and Nepean dams between 1907 and 1935 greatly increased the Upper Nepean Scheme's capacity.

How the dam was built

Work on Cordeaux Dam started in 1918 and was completed in 1926. The wall was built using cyclopean masonry - sandstone blocks, quarried from the site, fitted into an irregular pattern and packed with sandstone concrete.

Cordeaux is a curved dam with an unlined spillway to the left of the dam wall. Cement and metal were transported to the site from the main southern railway 21 kilometres away using a five kilometre steam operated aerial ropeway built across the Nepean Gorge. The final journey was completed by a narrow gauge rail line.

A township for workers was constructed, with barracks for single men and small cottages for married men.

Later improvements

Cordeaux Dam was upgraded in 1988 with a system of drains in the wall and foundations, to meet modern dam safety standards.

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