Some here will remember Brent's EPOD from a couple of years back showing the difference between the north and south arms of the GSL caused by the railroad causeway. http://epod.usra.edu/blog/2012/09/great-salt-lake-causeway.html (north to the left) I was reminded of that earlier today (yesterday if you are reading this Tuesday) when I saw something similar. http://users.wirelessbeehive.com/~paw/temp/GSL-1.JPG (railroad causeway on left, causeway described below on the right, in both north is to the left) But the thing is, I was over the south arm, quite near I-80 with Stansbury Island in the distance. It would appear the causeway-like structure in the south end is causing the same thing to happen. So going north to south we now go from blue water to green water, then fades back to blue and one more change to green. My first thought was that his "other" causeway was put there by those that mine minerals from the GSL. http://epod.usra.edu/blog/2012/08/evaporation-ponds-near-great-salt-lake.htm... But as Brent described in his EPOD the water on the south side of the causeway is lower in minerals. To quote the King of Siam, "Is a puzzlement" (here played by a Vladimir Putin look-alike http://vimeo.com/45346724). Another view of the south end color change looking south toward Stansbury Island and the Tooele Valley. http://users.wirelessbeehive.com/~paw/temp/GSL-2.JPG patrick