The net water supplies to Lake Superior were above average in August. The level of Lake Superior rose 4 cm/1.5 in. last month, while on average the lake rises 1 cm/0.4 in. in August. The Lake Superior level at the beginning-of-September is 25 cm/9.8 in. above average, 9 cm/3.5 in. above the level recorded a year ago at this time, and 59 cm/23 in. above its chart datum level.
The net water supplies to Lake Michigan-Huron were near average in August. The level of Lake Michigan-Huron fell 4 cm/1.5 in. last month, which is the average decline in August. The level of Lake Michigan-Huron is 44 cm/17 in. above its long-term average beginning-of-September level, 16 cm/6 in. higher than it was a year ago, and 96 cm/37 in. above its chart datum level.
The level of Lake Superior is expected to begin its seasonal decline in September, and the level of Lake Michigan-Huron is expected to continue its seasonal decline.
