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Big stonefly, Six Mile Falls, Sidney.

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Stoneflies are one of the largest freshwater aquatic insects in North American rivers and require very high water quality -- cool, rocky, well-oxygenated riffles, runs and rapids -- to thrive. As such, they are a key indicator of improvements or declines in water quality.

Studies by the Maine Department of Environmental Protection on the restored reach of the Kennebec River indicate that populations of stonefly and other water quality sensitive aquatic insects mushroomed within months after the Edwards Dam was removed in the summer of 1999. Click here to read more.

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