Gunnison Bay, the north arm of the Great Salt Lake, is colored red like wine. The coloration of the water is caused by pigments such as carotenoids produced by two phytoplankton, the algae Dunaliella Salina and the bacteria Halobacterium.
The surfactants metabolized by the organisms create foam on the surface of the water. It first forms as lines parallel to the waves. The foam is then blown into streaks by the wind. This foam generation occurs more often in the north arm of the lake. Photo taken November 11, 2014 by  Brent Watson for the Earth Science Photo of the Day