South Harbor space 629
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Boat launches near South Harbor space 629
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Typical flow by month
2021 to 2025
The water at South Harbor space 629 typically runs highest in June, at a median 83 cfs, and lowest in February, at 34 cfs. The highest flow on record for any single day is 982 cfs, in 2025.
| Month | Typical (cfs) | Usual range (cfs) | Relative level |
|---|---|---|---|
| January | 46 | 19 to 153 | |
| February | 34 | 16 to 119 | |
| March | 42 | 19 to 88 | |
| April | 37 | 19 to 88 | |
| May | 81 | 48 to 180 | |
| June | 83 | 59 to 136 | |
| July | 55 | 38 to 110 | |
| August | 39 | 15 to 102 | |
| September | 83 | 29 to 184 | |
| October | 81 | 38 to 197 | |
| November | 47 | 23 to 127 | |
| December | 43 | 14 to 160 |
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 4 years of record. Statistics published by the US Geological Survey for Twelvemile C near Petersburg AK (site 15087585). Conditions on any given day can fall well outside the usual range. Check the current reading before you go.
Current conditions
Waves
0.6 ft @ 2s
Wind
11 kt
Gusts 33 kt
Water
55°F
Air
50°F
Streamflow
91 cfs
Normal (25th)
Water level
23.27 ft
Rain chance
100%
Forecast outlook
Forecast from Open-Meteo global models (NOAA & ECMWF). See full conditions →
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