Flathead Lake Water Level
Montana · updated daily from the U.S. Geological Survey
2893.04 ft
Flathead Lake is high for this time of year and steady (+0.06 ft in the last 7 days).
Change since yesterday: +0.00 ft
Reading as of 2026-08-14 · higher than 99% of August readings on record
Where Flathead Lake sits historically
Today's level compared with every reading in our 26.9-year record for this lake.
Since yesterday
+0.00 ft
7-day change
+0.06 ft
30-day change
-0.01 ft
1-year change
+0.45 ft
Last 30 days
Last 12 months
Full history (26.9 years)
Flathead Lake records and averages
| Current level | 2893.04 ft |
|---|---|
| Record high | 2893.57 ft (2022-06-24) |
| Record low | 2883.13 ft (2008-04-10) |
| Average of all readings | 2889.6 ft |
| Data span | 26.9 years (9,812 readings) |
Frequently asked questions
Is Flathead Lake full right now?
As of 2026-08-14, Flathead Lake sits at 2893.04 ft, which is high for this time of year.Over the past 30 days the level has fallen 0.01 ft.
What is the water level at Flathead Lake today?
The most recent reading is 2893.04 ft (2026-08-14), sourced from the U.S. Geological Survey. Readings on this page refresh automatically as the agency publishes new data.
What is the highest Flathead Lake has ever been?
The highest level 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 26.9 years of readings.
Is Flathead Lake low for this time of year?
Compared with every August in our records, the current level is higher than 99% of them — high 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.
Why is Flathead Lake changing right now?
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 0.01 ft over the past 30 days. For the operational reason on any given week, check the U.S. Geological Survey directly.
How much has Flathead Lake changed over the past year?
The level is +0.45 ft compared with this date last year (2893.04 ft today). The full-history chart above covers 26.9 years, with a record high of 2893.57 ft and a record low of 2883.13 ft.
Nearby lakes in Montana
Source: the U.S. Geological Survey. Readings are provisional and subject to revision by the publishing agency. All Montana lake levels.