Concrete tanks on Eyre Highway

I'm just looking at some pictures I took in 2003 and I'm trying to work out exactly where they are. It is a series of about 7 or 8 concrete tanks on the left as one drives along Eyre Highway somewhere between Port Augusta and Ceduna. I think they are probably between Port Augusta and Iron Knob actually - but I'm not sure exactly where. The tanks are probably about 50000 gallons and heavily done over with art work. Can anyone please tell me where they are exactly - how far are they roughly from the nearest town?

Thanks

Jeff