i understand that when the run off is going to head upstream and look for water changes and feeder creeks/streams. Is that correct??
Yes mate that is pretty much the case, I have found that at that time of year the water levels have dropped substantially which quite often will require you to fish at appropriate stages of the tide
to get the best from the runoffs. The key is to work out the tides( 5hrs difference from darwin at the sth bridge) for the area and get there on the high and fish the outgoing as this is when the "good" tannin water is going to start pumping out of the creek after being being banked up by the tide
there are many good creeks to fish on the south and which one fishes best at any given time is anyones guess, the more time you fish it the more likely you are to know where the fish are holding
don't limit yourself to feedercreeks though the numerous backeddies on the river are all worth a cast
once the time comes you should have done at least one recon trip to on the sth to give you a general idea of the lay of the river and some of it's potential hazards
......................Daly 
