Cordeaux Dam

Latest dam level
%

View all dam & rainfall levels
Status Open to Public

Visit the Dam

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.

Things to do

Large Group notifictaion image and link

Opening hours

Dam grounds

10am to 5pm daily
Extended hours, 10am to 7pm, on weekends and public holidays during daylight saving time
Entry is free
No entry is permitted 15 minutes prior to closing time

Directions

Cordeaux Dam is about 94 kilometres drive from Sydney. From Sydney take the Hume Highway (F5) south towards Canberra. Past Campbelltown, take the Wollongong/Picton turnoff. The Cordeaux Dam entrance is about 10 minutes on the right, and is signposted.

Facilities

  • Childrens playground
  • Drinking water
  • Electric barbeques
  • Parking
  • Picnic shelters
  • Toilets & disabled toilets
  • Viewing areas
  • Hot Water

Fishing

Restrictions

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:

  • No wood, charcoal or solid fuel barbeques. Penalties of up to $5,500 apply
  • Portable gas barbeques are permitted (except during total fire bans)
  • No fishing, boating or swimming
  • No camping
  • No dogs, horses or other pets
  • No access allowed to restricted and Special Areas
  • No smoking within 10 metres of children’s playgrounds and four metres of shelters, toilets and public buildings
  • Keep to vehicle speed limits and be aware of pedestrians
  •  

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

The Cordeaux experience

Top 5 things to see and do

1. 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 Tutenkhamun’s tomb in 1922. Construction of Cordeaux Dam started in 1918 and was completed in 1926.

2. 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.

3. 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.

4. Visit the memorial

A memorial garden in the picnic grounds and a plaque on the valve house on the dam wall pay 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.

5. 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 barbeques, 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.

Facts & 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.

Dam Summary

57
Metres High
Length: 405 metres
93,640 ml total operating capacity
Size of lake:
7.8 km 2
Catchment: 91 square kilometres

Dam Wall

Size Measurement
Length 405m
Thickness of base m
Width of central spillway m
Concrete mass t
Width of auxillary spillway m
Length of auxillary spillway m

Lake and Catchment

Size Measurement
Area 7.8km2
Length of lake km
Length of foreshores km
Maximum depth of reservoir m
Catchment area 91km2
Annual average rainfall mm

Pipelines

Size Measurement
Diameter mm
Length km each
Capacity ML per day
88.0
Tuesday 21 October
0.2
2,272,479 ML
2,581,850 ML
9,633 ML
1,377 ML
3,524 ML
Tuesday 21 October
Cordeaux Dam
Upper Nepean
Tuesday 21 October
76.3
71,411
93,640
77,253
70,839
70,776
-5,842
572
635
82.5
75.7
75.6
-6.2
0.6
0.7