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Here are some USGS Web pages with more information on eutrophication and Anywhere:

Nutrients National Synthesis Project: nutrients in rivers, streams, and aquifers in the United States This Nutrients National Synthesis Project site on the U.S. study of nutrients, especially nitrogen and phosphorus, as contaminants in high concentrations links to an overview, study team, featured reports, publications, and national datasets. (Score: 1.380)

National Water-Quality Assessment (NAWQA) Program - Willamette Basin study unit National Water-Quality Assessment (NAWQA) Program study on the Willamette Basin with research personnel, surface water trends study, dioxins and furans data, data on trace organic compounds and elements in surface and ground water, and publications. (Score: 0.783)

Eutrophication: Its Causes & Effects (Score: 0.690)

Stream Water Quality in the Conterminous United States -- Status and Trends of Selected Indicators During the 1980s (Score: 0.688)

University of Southern Louisiana (USL) Summer Science Teachers Enhancement Institute wetland science lesson plans Links to collections of classroom lesson plans on general science techniques and wetland subjects developed by science teachers at summer institutes. (Score: 0.449)

Hydrologic studies in the Upper Klamath Basin, Oregon Overview of Klamath ecological research and links to USGS Klamath studies on ground water, nutrients, sediment oxygen demand, fish response to water quality, sucker ecology, publications, bibliographies, and data. (Score: 0.305)

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About eutrophication:

Definition: Aging of a lake or slow-moving stream by biological enrichment of its water. The process can result in waters rich in mineral and organic nutrients that promote a proliferation of plant life, especially algae, which reduces the dissolved oxygen content and often causes the extinction of other organisms. [Adapted from Concise Columbia Electronic Encyclopedia, 1999 & American Heritage Dic. of the English Language, 4th ed.]