Great Bay Marine Inc
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Boat launches near Great Bay Marine Inc
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Typical flow by month
2002 to 2026
The water at Great Bay Marine Inc typically runs highest in March, at a median 42 cfs, and lowest in September, at 2.5 cfs. The highest flow on record for any single day is 1,170 cfs, in 2006.
| Month | Typical (cfs) | Usual range (cfs) | Relative level |
|---|---|---|---|
| January | 20 | 12 to 37 | |
| February | 17 | 9.8 to 33 | |
| March | 42 | 27 to 69 | |
| April | 37 | 23 to 56 | |
| May | 17 | 10 to 34 | |
| June | 11 | 5.3 to 23 | |
| July | 4.0 | 2.0 to 12 | |
| August | 3.2 | 0.9 to 12 | |
| September | 2.5 | 0.8 to 8.9 | |
| October | 7.2 | 2.2 to 21 | |
| November | 17 | 8.3 to 30 | |
| December | 25 | 13 to 49 |
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 24 years of record. Statistics published by the US Geological Survey for Winnicut River at Greenland, near Portsmouth, NH (site 01073785). Conditions on any given day can fall well outside the usual range. Check the current reading before you go.
Current conditions
Waves
3.0 ft @ 5s
Wind
4 kt
Gusts 20 kt
Water
61°F
Air
44°F
Streamflow
1.8 cfs
Normal (39th)
Water level
4.42 ft
Rain chance
0%
Forecast outlook
Forecast from Open-Meteo global models (NOAA & ECMWF). See full conditions →
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