LaSalle Canyon Falls, viewed from behind, begins to thaw in late winter in Starved Rock State Park near LaSalle, Illinois. The 20-foot (6-meter) waterfall can completely freeze in winter. As it thaws, the ice thins and can become almost translucent, forming dramatic green and blue colors as the ice of varying thickness refracts sunlight to different degrees. Here, part of the icefall has melted as is once again flowing as a waterfall.
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