Go Sail Flathead Lake
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Around Go Sail Flathead Lake
Data Source: Recreation.gov · Source: USGS GNIS · Public land: USGS PAD-US
Typical flow by month
1939 to 2026
The water at Go Sail Flathead Lake typically runs highest in June, at a median 24,700 cfs, and lowest in September, at 5,615 cfs. The highest flow on record for any single day is 72,700 cfs, in 1948.
Show the numbers
| Month | Typical (cfs) | Usual range (cfs) |
|---|---|---|
| January | 9,960 | 8,140 to 12,000 |
| February | 8,970 | 6,900 to 11,900 |
| March | 7,780 | 5,720 to 10,200 |
| April | 8,790 | 6,270 to 13,500 |
| May | 18,500 | 12,600 to 25,300 |
| June | 24,700 | 15,600 to 36,150 |
| July | 12,500 | 9,060 to 16,500 |
| August | 5,700 | 4,270 to 7,620 |
| September | 5,615 | 4,255 to 7,620 |
| October | 7,020 | 4,710 to 9,080 |
| November | 8,030 | 5,810 to 10,500 |
| December | 9,760 | 7,720 to 12,100 |
Typical is the median of each month’s daily median values, and the usual range runs from the median 25th to the median 75th percentile, across about 87 years of record. Statistics published by the US Geological Survey for Flathead River near Polson MT (site 12372000). Conditions on any given day can fall well outside the usual range. Check the current reading before you go.
Current conditions
Today · Fri
69Maybe/ 100
Wind 11 kt · High 56°F
CloudyHigh 56°F, low 36°FRain 4%Wind 11 kt, gusts 20
Streamflow
7,190 cfs
Normal (48th)
Water level
5.44 ft
Water
47°F
National Weather ServiceBelow flood stage
Flood stage 18 ft. NWS reads 5.45 ft here.
NWS forecast: 5.45 ft by Fri 5 AM, below flood stage.
Forecast from Open-Meteo global models (NOAA & ECMWF). Flood stages and forecasts: NOAA National Weather Service.
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