A Great Lakes Primer. Great Lakes Basin. Great Lakes Profile. Morphometry and Development. Phosphorus and Eutrophication. Trophic State Index. Trophic State Index. Trophic State Index. Trophic State Index. Trophic State Index. Trophic State Index. Toxic Substances. Invasive Species.
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183 non-indigenous species in the Great Lakes (NOAA)
Areas of Concern (AOCs): severely degraded sites with impaired beneficial use
Remedial Action Plans (RAPs): specify problems and methods of correcting them
Lakewide Management Plans (LaMPs): plan to assess, restore, and protect ecosystem health
Waukegan Harbor (IL)
Outboard Marine Corporation
Presque Isle Bay (PA)
PAHs, heavy metals
Rouge River (MI)
Urban storm water discharges, CSOs,
nonpoint source pollution, and
municipal and industrial discharges
Toxaphene was a popular replacement for DDT until being banned in 1982. Here, atmospheric sampling and back-trajectory analysis are applied to quantify rates of deposition and sources for Lake Superior.
Beach closing due to fecal contamination are closely associated with public perception of water quality
Numbers on x-axis refer to depth zones: 1 = shallow,
2 = intermediate, 3 = deep
Black area is region of anoxia.
Number at bottom is depletion rate.
Mirex is an organic chemical used as a fire retardant and insecticide (fire ants). It has a long half-life. It was found to be present in fish in northern Lake Ontario, but no source was identified.