Monitoring Minnesota's lakes

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near Alexandria, MN — The side mirror of a research team's truck reflects Lake Carlos and the surrounding fall foliage on Monday, Oct. 5, 2010. Lake Carlos, located five miles north of Alexandria, Minn., is being studied as part of the Sentinel Lakes Project. (MPR Photo/Ann Arbor Miller) link to this photo

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near Alexandria, MN — Hydrologist Richard Kiesling readies to collect water samples from Lake Carlos on Monday, Oct. 5, 2010. The lake is one of 24 Minnesota lakes that are being studied to see how they are handling global warming, development, invasive species and urban runoff. (MPR Photo/Ann Arbor Miller) link to this photo

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near Alexandria, MN — Emily Resseger, left, and Sarah Elliott, right, prepare documentation and an instrument called a sonde to measure water quality in Lake Carlos on Monday, Oct. 4, 2010. (MPR Photo/Ann Arbor Miller) link to this photo

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near Alexandria, MN — Lake Carlos, located five miles north of Alexandria, Minn., is one of 24 lakes across Minnesota that are being studied to see how the lakes are handling global warming, development, invasive species and urban runoff. (MPR Photo/Ann Arbor Miller) link to this photo

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near Alexandria, MN — Emily Resseger, a hydrologic technician with U.S. Geological Survey and a master's student at the University of Minnesota, prepares a sampler on Lake Carlos on Monday, Oct. 4, 2010. The device will be rinsed in lake water multiple times before an actual sample of lake water is collected for study. (MPR Photo/Ann Arbor Miller) link to this photo

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near Alexandria, MN — Emily Resseger, a hydrologic technician with U.S. Geological Survey and a master's student at the University of Minnesota, adjusts the lid on a sample of algae from Lake Carlos on Monday, Oct. 4, 2010. (MPR Photo/Ann Arbor Miller) link to this photo

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near Alexandria, MN, U.S.A. — Hydrologist Richard Kiesling holds a sample of algae from Lake Carlos on Monday, Oct. 4, 2010. The lake, located five miles north of Alexandria, Minn., is one of 24 Minnesota lakes being studied as part of the Sentinel Lakes Project. (MPR Photo/Ann Arbor Miller) link to this photo

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near Alexandria, MN — The research team heads back to shore on Monday, Oct. 4, 2010, after collecting water and algae samples from Lake Carlos. (MPR Photo/Ann Arbor Miller) link to this photo

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near Alexandria, MN — An orange buoy marks a research site on Lake Carlos near Alexandria, Minn., on Monday, Oct. 4, 2010. Researchers typically spend a couple of hours on the lake collecting water samples from various elevations. (MPR Photo/Ann Arbor Miller) link to this photo