St. Joe HUC8 17010304
A 4,781 km² sub-basin of the Pacific Northwest region in ID, MT. 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
50
Moderate
Drought index
311
Extreme
Area in D2+
76.23%
0% exceptional (D4)
Gauges below normal
50%
of 4 reporting
Median flow
78%
p21 of record
Water assets
1,168
12 springs · 127 wells
USGS gauges (4)
- St Joe River at Red Ives Ranger Station, ID1241387562 cfsp9 · much below normal
- ST JOE RIVER AT RAMSDELL NR ST MARIES ID12415135316 cfsp10 · much below normal
- ST MARIES RIVER NR SANTA, ID1241490045 cfsp33 · normal
- ST JOE RIVER AT CALDER, ID12414500403 cfsp36 · normal
Recent conditions
| Date | DSCI | D2+ % | Gauges low | Flow pct |
|---|---|---|---|---|
| 2026-09-07 | 311 | 76.23 | 2/4 | p21 |
Top water assets
- 69Saint Joe Riverriver
- 69Yankee Bar Creekriver
- 69Tinear Creekriver
- 69Homestead Creekriver
- 69Bedrock Creekriver
- 69Sherlock Creekriver
- 69Homestead Creekriver
- 69Heller Creekriver
- 69Copper Creekriver
- 67St Joe River At Red Ives Ranger Station, Idriver