Heron Island is a modern housing development with some moorings
The bridge to the Island is the site of the old Caversham Mill.
This is the 1852 picture by Edmund Havell the Elder -

Caversham Mill 1852 by Edmund Havell the Elder

The old mill was replaced in the late 1800s by a more utilitarian version.
This is seen in these two views -

Caversham Mill, lantern slide 1883-1906, W.C.Hughes, research by Dr Wilson, courtesy of Pat Furley

Caversham Mill 1923

Here is the late 1950s aerial view which also shows what was then the British Technical Cork Factory on what is now Heron Island -

Caversham Mill and the British Technical Cork Factory, 1950s