Avon Dam

Avon Dam
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Status Closed to Public

Avon Dam is closed while we undertake flood repairs

Avon Dam is closed while we undertake flood repairs

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Visit the Dam


  • Drinking water
  • Barbecues
  • Parking
  • Toilets
  • Viewing areas
  • Disabled toilets
  • Picnic shelters

Remarkable for its Egyptian inspired architecture and landscaping, a visit to Avon Dam is like stepping back in time. Massive stone gateways guard the entrance to the dam wall, and the grounds resemble an Egyptian oasis. Avon is one of four dams that make up the Upper Nepean water supply scheme south of Sydney on the Illawarra Plateau.

Lookout points

Dam wall

From the top picnic area, drive or walk above the concrete spillway to the lower carpark near the dam wall, then walk across the wall for impressive views of the lake upstream and gorge downstream.

Viewing area near serpentine spillway

From the lower carpark near the dam wall, walk south along a flat pathway to a viewing area near the serpentine spillway for more views of the lake.

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


View in Maps

Avon Dam is about 100 kilometres drive from Sydney.

Follow the Hume Highway (F5) south from Sydney and take the Bargo exit to Avon Dam.


  • Drinking water
  • Barbecues
  • Parking
  • Toilets
  • Viewing areas
  • Disabled toilets
  • Picnic shelters



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 barbecues. Penalties of up to $5,500 apply
  • Portable gas barbecues are permitted (except during total fire bans)
  • No fishing, boating or swimming
  • No camping
  • No dogs, horses or other pets
  • No model aircraft or drones
  • 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 WaterNSW dams will be closed on ALL Total Fire Ban days.

The Avon 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 Tutankhamun's tomb in 1922. Construction of Avon Dam started in 1921 and was completed in 1927.

2. Walk across the dam wall

After your photo under the Egyptian style gateway, walk across the curved wall of the dam. It's 223 metres to the other end, and you're 72 metres above the river below. Pause halfway and admire the views of the lake upstream. Look downstream and you'll see the rockfill embankment built in the 1970s to strengthen the wall.

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. Avon Dam retains remnant features that evoke images of an Egyptian revival landscape. As you walk from the dam wall to the viewing area near the spillway, keep an eye out for remnants of fountains and ponds to your left, and an old fernery to your right.

4. Soak up the views

Elevated paths and the dam wall provide excellent views of the lake in its natural bushland setting. Avon Dam draws water from a catchment of 142 square kilometres of mostly protected bushland. Look out for the jagged teeth of the serpentine spillway. The unusual design allows more water to spill from the lake during floods.

5. Relax with a picnic

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. Electric barbecues, drinking water, picnic tables and toilet facilities are located throughout the grounds. There's a row of older-style picnic shelters closer to the dam walk and lake.

Dam Summary

Metres High
Length: 223 metres
Size of lake:
10.5 km 2
146.7 gl total operating capacity
Catchment: 142 square kilometres

Facts & History

Located about 100 kilometres south of Sydney, Avon Dam was the third and largest of the four dams constructed to collect water from the Illawarra Plateau. Created by damming the Avon River and completed in 1927, Avon Dam's main role today is to supply water to the Illawarra region. It is Sydney's second largest dam after Warragamba, but has a small catchment.

Water from Nepean Dam and water transferred via Nepean Dam from the Shoalhaven can be sent to Avon to secure water for the Illawarra.

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 Avon Dam began in 1921 and was completed in 1927. The curved dam wall was built using cyclopean masonry. This consisted of sandstone blocks, quarried from the site, fitted into an irregular pattern and packed with sandstone concrete. The blocks were lifted into place by electric powered cranes.

The rock was quarried to make a deep cut through a ridge to a neighbouring creek to provide the dam's spillway, which discharges into the Avon River 800 metres downstream.

A 9.6 kilometre road was built from Bargo railway station to transport construction materials. The dam builders lived near the construction site in single-storey barracks for single men. Land was placed at the disposal of the married men who were assisted in constructing temporary houses for themselves and their families.

Later improvements

To meet modern dam safety standards, Avon Dam was strengthened in 1971 by buttressing the downstream face with a rockfill embankment.

A tunnel linking Avon and Nepean dams, to enable the transfer of water between dams in either direction, was completed in 1973.

In the 1980's the downstream face of the dam was strengthened. In 2005 the access road was upgraded for safety purposes, and in 2006 works were undertaken above the operating level of it's gravity fed outlet.


Tuesday 17 May
2,573,926 ML
2,581,850 ML
9,342 ML
1,335 ML
50,768 ML
Tuesday 17 May
Avon Dam
Upper Nepean
Tuesday 17 May