Lake Superior, MI

As of 2026-09-30, Lake Superior sits at 601.99 ft, which is about average for this time of year. Over the past 30 days the level has fallen 0.22 ft.

The most recent reading at Lake Superior is 601.99 ft (2026-09-30), sourced from NOAA CO-OPS (IGLD 1985). Readings on this page refresh automatically as the agency publishes new data.

The highest level for Lake Superior in our records is 603.49 ft on 2019-10-21. The lowest is 599.70 ft on 2007-03-21. Our record covers about 36 years of readings.

Compared with every September in our records, the current level is higher than 50% of them, which we classify as about average for this time of year. Seasonal comparison matters more than the raw number, because most reservoirs draw down predictably through late summer and refill over winter and spring.

Great Lakes levels move for three main reasons: rainfall and runoff into the basin, releases through the dam for downstream water supply, power generation or flood control, evaporation during hot months, and seasonal drawdown schedules set by the operating agency. Lake Superior has fallen 0.22 ft over the past 30 days. For the operational reason on any given week, check NOAA CO-OPS (IGLD 1985) directly.

Lake Superior is -0.16 ft compared with this date last year (601.99 ft today). The full-history chart above covers 36 years, with a record high of 603.49 ft and a record low of 599.70 ft.