Cave Point County Park - Door County, WI - Midwest Photography
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Warmer temps brought on a very pretty green colored water.

I read that the color change is due to wave action that stirs up bottom sediments and grinds air bubbles into the water, and precipitates of dissolved calcium carbonate that come out of solution when water temperatures rise.

http://articles.chicagotribune.com/2002-01-20/news/0201200243_1_lake-michigan-murky-appearance-water