St. Marys HUC8 03070204
A 4,089 km² sub-basin of the South Atlantic-Gulf region in FL, GA. Drought coverage is from the US Drought Monitor (map of 2026-10-13); streamflow classes place each USGS gauge's latest reading against its own day-of-year record.
Health score
83
Healthy
Drought index
43
Abnormally dry
Area in D2+
0%
0% exceptional (D4)
Gauges below normal
0%
of 2 reporting
Median flow
223%
p63 of record
Water assets
1,443
0 springs · 267 wells
USGS gauges (4)
- NORTH PRONG ST. MARYS RIVER AT MONIAC, GA0222850058 cfsp61 · normal
- ST. MARYS RIVER NEAR MACCLENNY, FL02231000356 cfsp65 · normal
- ST MARYS RIVER AT FERRY LANDING NEAR FOLKSTON, GA022311757,490 cfsno long-term record
- ST MARY'S RIVER AT I-95, NEAR KINGSLAND, GA0223125410,600 cfsno long-term record
Recent conditions
| Date | DSCI | D2+ % | Gauges low | Flow pct |
|---|---|---|---|---|
| 2026-10-21 | 43 | 0 | 0/2 | p63 |
| 2026-10-20 | 43 | 0 | 0/2 | p65 |
| 2026-10-19 | 43 | 0 | 0/2 | p67 |
| 2026-10-18 | 43 | 0 | 0/2 | p72 |
| 2026-10-17 | 43 | 0 | 0/2 | p79 |
| 2026-10-16 | 43 | 0 | 0/2 | p82 |
| 2026-10-15 | 50 | 0 | 0/2 | p83 |
| 2026-10-14 | 50 | 0 | 0/2 | p86 |
| 2026-10-13 | 50 | 0 | 0/2 | p91 |
| 2026-10-12 | 50 | 0 | 0/2 | p89 |
| 2026-10-11 | 50 | 0 | 0/2 | p89 |
| 2026-10-10 | 50 | 0 | 0/2 | p89 |
| 2026-10-09 | 50 | 0 | 0/2 | p80 |
| 2026-10-08 | 117 | 0 | 0/2 | p74 |
Top water assets
- 65Saint Marys Riverriver
- 65Saint Marys Riverriver
- 65Little Saint Marys Riverriver
- 65River Styxriver
- 65Saint Marys Riverriver
- 65Little Saint Marys Riverriver
- 65St Marys River At Ferry Landing Near Folkston, Gariver
- 65Saint Marys Riverriver
- 65St. Marys River Near Macclenny, Flriver
- 65Middle Prong Saint Marys Riverriver