Lake Michigan is forecasted to reach a record low water level this January through March. The current record low-level occurred in March 1964 at 576.12 ft.
The graph below, from the NOAA Great Lakes Environmental Research Laboratory (GLERL), shows Lake Michigan's lakewide monthly and annual average level, as well as the average level for the period of record. Click the image to see a larger version.
Below is the press release from the U.S. Army Corps of Enginners.
U.S. ARMY CORPS OF ENGINEERS
477 MICHIGAN AVENUE
DETROIT, MICHIGAN 48226
SEPTEMBER 2012 GREAT LAKES WATER LEVEL SUMMARY
Lake Michigan‐Huron’s monthly mean level for September was 576.97 feet, which was 4 inches lower than August’s level. The level for September was 6 inches below chart datum, 11 inches below its level of last year and 26 inches below its long-term average.
Precipitation on the Lake Michigan‐Huron basin was 74% of average in September and 92% of average over the past 12 months.
Lake Michigan‐Huron’s outflow through the St. Clair River was below average in September.
The water level of Lake Michigan‐Huron is predicted to match record-low water levels set in 1964 in November and December and then set new record lows in January through March.
Lake Michigan‐Huron is forecasted to range from 11 to 19 inches below chart datum over the next six months.
The water levels are expected to be 28 to 29 inches below their long-term average through March and range 11 to 17 inches below last year’s levels.
For complete Great Lakes September water level information, click here.
For marine forecasts and other information for the Great Lakes click here.