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Around South Prong Saint Marys River
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Data Source: Recreation.gov · Public land: USGS PAD-US
About this river
South Prong Saint Marys River is a 25.4 mile river near Cheapskate Adventures in Florida. Streamflow is measured at the USGS gauge ST. Marys River near Macclenny, FL (site 02231000). The National Hydrography Dataset places it at stream order 5. Reach geometry comes from the USGS National Hydrography Dataset.
Typical flow by month
1927 to 2026
South Prong Saint Marys River typically runs highest in August, at a median 518 cfs, and lowest in May, at 70 cfs. The highest flow on record for any single day is 33,300 cfs, in 2012.
Show the numbers
| Month | Typical (cfs) | Usual range (cfs) |
|---|---|---|
| January | 231 | 91 to 727 |
| February | 407 | 146 to 1,040 |
| March | 378 | 148 to 1,110 |
| April | 252 | 95 to 730 |
| May | 70 | 41 to 213 |
| June | 87 | 43 to 318 |
| July | 285 | 89 to 760 |
| August | 518 | 183 to 1,230 |
| September | 459 | 138 to 1,005 |
| October | 192 | 63 to 531 |
| November | 96 | 50 to 223 |
| December | 138 | 57 to 321 |
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 100 years of record. Statistics published by the US Geological Survey for ST. Marys River near Macclenny, FL (site 02231000). Conditions on any given day can fall well outside the usual range. Check the current reading before you go.
Made to print
Put South Prong Saint Marys River on your wall
This river section as an art print, drawn over the real terrain with its miles, plus the trails, roads and peaks around it. Pick the colors and the size, and see the finished print before you buy. From $39, shipping included.
Embed this gauge on your site
Paste this snippet anywhere, an outfitter page, a club site, a trip report, to show South 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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