South Fork Boise HUC8 17050113
A 3,384 km² sub-basin of the Pacific Northwest region in ID. 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
59
Moderate
Drought index
183
Moderate
Area in D2+
7.88%
0% exceptional (D4)
Gauges below normal
50%
of 2 reporting
Median flow
90%
p41 of record
Water assets
470
49 springs · 4 wells
USGS gauges (3)
- SF BOISE RIVER NR FEATHERVILLE ID13186000165 cfsp10 · much below normal
- SF BOISE RIVER AT ANDERSON RANCH DAM ID13190500314 cfsp71 · normal
- SF BOISE RIVER AT NEAL BRIDGE NR ARROWROCK DAM ID13192200500 cfsno long-term record
Recent conditions
| Date | DSCI | D2+ % | Gauges low | Flow pct |
|---|---|---|---|---|
| 2026-10-18 | 183 | 7.88 | 1/2 | p41 |
| 2026-10-17 | 183 | 7.88 | 1/2 | p33 |
| 2026-10-16 | 183 | 7.88 | 1/2 | p32 |
| 2026-10-15 | 183 | 7.88 | 1/2 | p31 |
| 2026-10-14 | 183 | 7.88 | 1/2 | p44 |
| 2026-10-13 | 183 | 7.88 | 0/2 | p41 |
| 2026-10-12 | 183 | 7.88 | 1/2 | p32 |
| 2026-10-11 | 183 | 7.88 | 1/2 | p29 |
| 2026-10-10 | 183 | 7.88 | 1/2 | p26 |
| 2026-10-09 | 183 | 7.88 | 1/2 | p33 |
| 2026-10-08 | 183 | 7.88 | 1/2 | p33 |
| 2026-10-07 | 183 | 7.88 | 1/2 | p33 |
| 2026-10-06 | 183 | 7.88 | 1/2 | p29 |
| 2026-10-05 | 183 | 7.88 | 1/2 | p33 |
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