Flathead Lake Private Harbor
Flathead Lake Private Harbor is a marina in Big Arm, Montana. The private marina provides 30-foot boat slips for purchase on a 99-year lease, with many including power.
Operator details
- Vessels
- Powerboat
Boater reviews
Rating from Google.
Around here
Around Flathead Lake Private Harbor
Data Source: Recreation.gov · Source: USGS GNIS · Public land: USGS PAD-US
Typical flow by month
1939 to 2026
The water at Flathead Lake Private Harbor 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
78Go/ 100
CloudyHigh 55°F, low 35°FRain 5%Wind 11 kt, gusts 21
Streamflow
7,210 cfs
Normal (46th)
Water level
5.45 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 11 PM, below flood stage.
Forecast from Open-Meteo global models (NOAA & ECMWF). Flood stages and forecasts: NOAA National Weather Service. See full conditions →
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