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| | USGS Programs in The Great Lakes |
 | | The Great Lakes system comprises Lakes Superior, Michigan, Huron, Erie, and Ontario and their connecting waterways---the St. Marys, the St. Clair, the Detroit, the Niagara, and the St. Law-rence Rivers; the Straits of Mackinac; Lake St. Clair; and the Welland Canal. |
 | | Lake level is controlled by the spillway to the St. Marys River at Sault Ste. |
 | | The analysis is delineating the high levels of the lakes, the timing of peat deposition, the changing climatic regimes, the extent of former wetlands, the deterioration and regrowth of wetlands, and the history of early human impacts on the wetlands. |
| water.usgs.gov /wid/html/gl.html (2560 words) |
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