U.S. Army Corps of Engineers
Lake Levels – End of August 2013
The Big Lake rose nearly half an inch in August – meeting the average increase for the month – and is now about 3 inches below its long-term average.
From the International Lake Superior Board of Control and the U.S. Army Corps of Engineers:
This past month the water supplies to both the Lake Superior and Lakes Michigan-Huron basins were above average. Currently, the Lake Superior level is about 8 cm below its long-term average beginning-of-September level, and 20 cm above the level recorded a year ago. It is 25 cm above its chart datum level. This past month the level of Lake Superior rose 1 cm, which is the average amount the lake rises in August. The level of Lake Superior is expected to begin its seasonal decline and fall slightly during September. The level of Lakes Michigan-Huron declined 1 cm this past month, less than the average decline of 4 cm in August. The level of Lakes Michigan-Huron is 44 cm below its long-term average beginning-of-September level, and is 16 cm higher than it was a year ago. Lakes Michigan-Huron is 8 cm above its chart datum level. The level of Lakes Michigan-Huron is expected to continue its seasonal decline during September.