沒看出密西根湖有什麽問題,

Historic High Water

The lake fluctuates from month to month with the highest lake levels in October and November. The normal highwater mark is 2.00 feet (0.61 m) above datum (577.5 ft or 176.0 meters). In the summer of 1986, Lakes Michigan and Huron reached their highest level at 5.92 feet (1.80 m) above datum.^[12] The high water records began in February 1986 and lasted through the year, ending with January 1987. Water levels ranged from 3.67 feet (1.12 m) to 5.92 feet (1.80 m) above Chart Datum.^[12] On February 21, the waters neared the all-time maximum.^[13]

Historic Low Water

Lake levels tend to be the lowest in winter. The normal lowwater mark is 1.00 foot (0.30 m) below datum (577.5 ft or 176.0 meters). In the winter of 1964, Lakes Michigan and Huron reached their lowest level at 1.38 feet (0.42 m) below datum.^[12] As with the highwater records, monthly low water records were set each month from February 1964 through January 1965. During this twelve month period water levels ranged from 1.38 feet (0.42 m) to 0.71 feet (0.22 m) below Chart Datum.