Kitchi-Gami Almanac

Current Map of Lake Superior


Minnesota Targets Ballast Water

Minnesota is moving ahead with a plan to regulate ballast water discharges from Great Lakes vessels that enter the state’s waters.

All commercial vessels - “lakers” as well as oceangoing ships - would be required to have a permit starting in the fall. The Minnesota Pollution Control Agency would phase in new requirements for treating ballast water to remove invasive species.

State officials have said that a federal law regulating ballast water discharges would be preferable, but maintain that the state is following a 2006 federal court order requiring governments to enforce Clean Water Act rules for ships by Oct. 1, 2008. Michigan requires permits, but only for oceangoing vessels.

Maritime industry officials have blasted the plan. Required testing of all ships’ ballast water may be impossible to enforce, according to Duluth Seaway Port Authority Facilities Manager Jim Sharrow, and “will be a quagmire that will turn ships away from our port.”


Lake Notes

Lake BulletThe U.S. Fish & Wildlife Service is looking at placing coaster brook trout on the federal endangered species list. The agency will be closely tracking the fish that are found only in the Great Lakes and their tributaries. The Sierra Club’s Michigan Chapter and the Huron Mountain Club sued the government to force the issue. A decision is due by December 15.
Lake BulletThe Port of Duluth-Superior’s 2008 St. Lawrence Seaway navigation season opened April 10, 2008, with arrival of the first oceangoing vessel, the Hong Kong-flagged Gadwall.


Lake Levels

Current Water Levels
The levels on the hydrographs are shown in both feet and meters above (+) or below (-) Chart Datum. Chart Datum, also known as Low Water Datum, for Lake Superior is 601.1 feet (183.2 meters). It is a reference plane to which water depth and Federal navigation improvement depths on navigation charts are referred.
Water Level Key


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