Ice formation in the St. Joseph channel. Lake Michigan EEGLE cruise Feb. 18, 2000 Lake Guardian pre-plume survey.

Ice formation in the St. Joseph channel. Lake Michigan EEGLE cruise Feb. 18, 2000 Lake Guardian pre-plume survey.

Ice formation in the St. Joseph channel. Lake Michigan EEGLE cruise Feb. 18, 2000 Lake Guardian pre-plume survey.

Pancake ice and ball ice in the St. Joseph channel. Lake Michigan EEGLE cruise Feb. 18, 2000 Lake Guardian pre-plume survey.

Coast Guard cutter towing ship through ice.

Freighter moving through channel in ice.

Average ice cover duration on Great lakes for winters 1973-2002. Produced by R. Assel, 2004

Average date of first ice cover formation on Great lakes for winters 1973-2002. Produced by R. Assel, 2004.

Average date of last ice cover on Great lakes for winters 1973-2002. Produced by R. Assel, 2004.

MODIS image of Great Lakes snow and ice cover. Taken on February 26, 2004 at 16:40. http://modis.gsfc.nasa.gov/

U.S. Coast Guard Arctic class ice breaker 'Mackinaw'. Used in GLERL CoastWatch ice research. 1997.

U.S. Coast Guard ice breaker 'Biscayne Bay'. Used in GLERL CoastWatch ice research. 1997.