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 2026-09-01); streamflow classes place each USGS gauge's latest reading against its own day-of-year record.
Health score
56
Moderate
Drought index
212
Severe
Area in D2+
12.26%
0% exceptional (D4)
Gauges below normal
50%
of 2 reporting
Median flow
36%
p20 of record
Water assets
1,443
0 springs · 267 wells
USGS gauges (4)
- NORTH PRONG ST. MARYS RIVER AT MONIAC, GA022285001 cfsp4 · much below normal
- ST. MARYS RIVER NEAR MACCLENNY, FL02231000323 cfsp37 · normal
- ST MARYS RIVER AT FERRY LANDING NEAR FOLKSTON, GA022311757,490 cfsno long-term record
- ST MARY'S RIVER AT I-95, NEAR KINGSLAND, GA02231254no readingno long-term record
Recent conditions
| Date | DSCI | D2+ % | Gauges low | Flow pct |
|---|---|---|---|---|
| 2026-09-07 | 212 | 12.26 | 1/2 | p20 |
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