how deep is sydney harbour

Sydney Harbour is roughly 45–50 metres deep at its deepest measured points, with most of the harbour much shallower.

Key depth facts

• The deepest spot in Sydney Harbour is a hole west of the Harbour Bridge between Dawes Point and Blues Point, measured at about 45–46 metres (around 150 feet).

• Much of the harbour is far shallower , with common depths under 10 metres and some areas only around 3 metres deep.

• Nautical sources describe general depths in the tens of feet, with typical values quoted from about 9 metres up to around 47 metres depending on location and tide.

Why answers vary

• Different sources quote average , navigable , or maximum hole depth, which is why numbers range from about 9 metres (shallow areas) to about 45–50 metres (deepest hole).

• The harbour floor is very uneven, with deep holes, wreck sites in ~30 metres of water, and large stretches of relatively shallow seabed.

Information gathered from public forums or data available on the internet and portrayed here.