Actually I seem to recall mentioning this flat water run in this post from 2005:
www.seabreeze.com.au/forums/Windsurfing/General/mallacoota/I remember I used to (early 90's) sail out and back from Karbeethong, and one day I went further than usual and got into the flat water behind Goodwin Sands, and thought - "hey this is cool, going fast on really flat water". Unfortunately GPSTC wasn't around then, and if it was a GPS was a dinosaur of what it can do today.
Happy times in 'coota though.
EDIT: just read my old post, I said the lower lake was good for everything except easterlies, I'm sure I meant westerlies.

(too offshore)