Volunteers monitor Minnesota's waters

(This  article was published in the March, 2009, Facets of Freshwater, the Freshwater Society’s newsletter. The newsletter is available at www.freshwater.org.) Last year, on about 1,500 lakes across Minnesota, volunteers leaned over the side of their boats and lowered a white metal disk into the water, carefully measuring how deep the disk descended until it vanished … Read more Volunteers monitor Minnesota's waters