Lake Macquarie is located on the Hunter coast of New South Wales, just south of Newcastle. It is classed as a lake and has a permanently open, trained entrance named after its adjacent town, Swansea.
Lake Macquarie is Australia’s largest coastal saltwater lake and supports a diversity of habitat types throughout its many sections, including extensive seagrass meadows, mangroves, saltmarsh, rocky reefs, oyster reefs, sand flats, mud flats and deep open waters. It also provides huge recreational value for water-based activities.
Water quality report card
As part of our water quality monitoring program we assess the water quality and ecosystem health of an estuary using a range of relevant indicators. We sample 13 sites on a monthly basis in Lake Macquarie as part of a collaborative program with Lake Macquarie City Council and Central Coast Council.
The most recent sampling was completed over 2020–21. Sampling is ongoing. A summary of the monitoring program is available on the Lake Macquarie City Council website in the state of the environment reporting in their annual reports.
Go to estuary report cards to find out what each grade means, read our sampling, data analysis and reporting protocols, and find out how we calculate these grades.
Physical characteristics
| Estuary type | Lake |
|---|---|
| Latitude | –33.09 (ºS) |
| Longitude | 151.66 (ºE) |
| Catchment area | 604.4 km2 |
| Estuary area | 114.1 km2 |
| Estuary volume | 64,6274.3 ML |
| Average depth | 5.7 m |
Tidal exchange volume
Tidal exchange volume or tidal prism data is available for this estuary. This tidal prism was measured in 1996.
| Tide state | Flow (ML) | Local tidal range (m) | Sydney Harbour tidal range (m) |
|---|---|---|---|
| Ebb flow | 1,180 | 1.18 | 1.34 |
| Flood flow | 10,890 | 1.16 | 1.29 |
Notes: km2 = square kilometres; m = metres; m3 = cubic metres; ML = megalitres.
Water depth and survey data
Bathymetric and coastal topography data for this estuary are available in our data portal.
Land use
Lake Macquarie drains a highly urbanised catchment. Other land use includes industrial and agricultural businesses. The western reaches of the catchment remain forested and protected within national parks.
Water use
Find out about water use in Lake Macquarie–Tuggerah catchment, including information about major water users, real-time flow data, and environmental and water sharing plans.
Web cam
The Swansea bar crossing web camera provides real-time video of conditions within the river entrance immediately offshore to help with bar crossings and boat safety.
National and marine parks
- Watagans National Park and Sugarloaf State Conservation Area are located within the western catchment of this estuary.
- This estuary does not flow into a marine park.
Community involvement
- The Central Coast Council Landcare Program helps coordinate a number of volunteer environmental groups. This includes Lake Macquarie Landcare, which supports dozens of local volunteer groups working to care for the environment around Lake Macquarie.
- The Central Coast Council's Environmental groups webpage provides links and information about a range of environmental groups located within the catchment.
- Volunteer with the Watagan weeders and help restore native bushland in Watagan National Park.
Local government management
Local councils manage estuaries within their area unless the estuary is attached to a marine park.
Lake Macquarie Council manages the Lake Macquarie estuary, and Central Coast Council manages about 15% of the southern Lake Macquarie catchment area.
Threatened species
Lake Macquarie supports habitat for many threatened species, such as the endangered swift parrot.
Read more about the biodiversity in our estuaries.