About this river
North Prong Saint Marys River is a 2.3 mile river near Okefenokee Adventures in Georgia. Streamflow is measured at the USGS gauge North Prong ST. Marys River at Moniac, GA (site 02228500). The National Hydrography Dataset places it at stream order 5. Reach geometry comes from the USGS National Hydrography Dataset.
Typical flow by month
1921 to 2026
North Prong Saint Marys River typically runs highest in February, at a median 99 cfs, and lowest in May, at 12 cfs. The highest flow on record for any single day is 11,400 cfs, in 1973.
| Month | Typical (cfs) | Usual range (cfs) | Relative level |
|---|---|---|---|
| January | 74 | 20 to 200 | |
| February | 99 | 40 to 267 | |
| March | 98 | 35 to 276 | |
| April | 53 | 19 to 168 | |
| May | 12 | 1.8 to 58 | |
| June | 13 | 1.1 to 75 | |
| July | 34 | 5.9 to 135 | |
| August | 77 | 21 to 239 | |
| September | 77 | 15 to 205 | |
| October | 29 | 5.7 to 121 | |
| November | 23 | 5.5 to 47 | |
| December | 31 | 9.7 to 79 |
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 81 years of record. Statistics published by the US Geological Survey for North Prong ST. Marys River at Moniac, GA (site 02228500). Conditions on any given day can fall well outside the usual range. Check the current reading before you go.
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Paste this snippet anywhere, an outfitter page, a club site, a trip report, to show North Prong Saint Marys River's live streamflow, water level and 7-day trend. It reads the USGS gauge directly, updates itself, and links back here.
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