Visited: late dry season
Recommendation: You cannot tell if it is open or not, there is conflicting advice online. Very, very odd. However, it is worth going if you are passing as, even in the late dry season, there is water present and lots of water birds that you can see from the road.
I really like this place but it is utterly confusing. It is well advertised and signposted but seems to be closed. Searching through official tourist sites gives conflicting information. I would not journey out there specifically without calling to see if they are actually open. However, if you are just passing on the way out of Kakadu National Park to Darwin, then it is definitely worth a look.
The access road winds up a short hill where the centre is but you can continue on the road and it sweeps down directly past the paddock where the water is. Even in October, there was plenty of water and huge numbers of birds there. Sitting in the campervan gave me some cover and let me photograph the birds with little disturbance.
Here are my best shots.
Australasian Darter (Anhinga melanogaster)
Comb-crested Jacana (Irediparra gallinacea)
Radjah Shelduck (Tadorna radjah)
Green Pygmy-goose (Nettapus pulchellus)
Gilbert's Dragon (Lophognathus gilberti)
Pacific Heron (Ardea pacifica)
Magpie Geese (Anseranas semipalmata)
Pied Heron (Ardea picata)
Plumed Whistling-Duck (Dendrocygna eytoni)