Flathead Lake, MT

As of 2026-10-12, Flathead Lake sits at 2892.26 ft, which is above average for this time of year. Over the past 30 days the level has fallen 0.86 ft.

The most recent reading at Flathead Lake is 2892.26 ft (2026-10-12), sourced from the U.S. Geological Survey. Readings on this page refresh automatically as the agency publishes new data.

The highest level for Flathead Lake in our records is 2893.57 ft on 2022-06-24. The lowest is 2883.13 ft on 2008-04-10. Our record covers about 27 years of readings.

Compared with every October in our records, the current level is higher than 75% of them, which we classify as above 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.

Reservoir levels move for four 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. Flathead Lake has fallen 0.86 ft over the past 30 days. For the operational reason on any given week, check the U.S. Geological Survey directly.

Flathead Lake is +1.41 ft compared with this date last year (2892.26 ft today). The full-history chart above covers 27 years, with a record high of 2893.57 ft and a record low of 2883.13 ft.