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 2026-09-01); streamflow classes place each USGS gauge's latest reading against its own day-of-year record.
Health score
72
Moderate
Drought index
208
Severe
Area in D2+
7.86%
0% exceptional (D4)
Gauges below normal
0%
of 2 reporting
Median flow
92%
p40 of record
Water assets
470
49 springs · 4 wells
USGS gauges (3)
- SF BOISE RIVER NR FEATHERVILLE ID13186000171 cfsp27 · normal
- SF BOISE RIVER AT ANDERSON RANCH DAM ID13190500602 cfsp52 · normal
- SF BOISE RIVER AT NEAL BRIDGE NR ARROWROCK DAM ID13192200500 cfsno long-term record
Recent conditions
| Date | DSCI | D2+ % | Gauges low | Flow pct |
|---|---|---|---|---|
| 2026-09-07 | 208 | 7.86 | 0/2 | p40 |
Top water assets
- 69South Fork Boise Riverriver
- 69Vienna Creekriver
- 69South Fork Boise Riverriver
- 69Salt Creekriver
- 69Little Smoky Creekriver
- 69Tally Baker Creekriver
- 69Johnson Creekriver
- 69Little Smoky Creekriver
- 69South Fork Boise Riverriver
- 69South Fork Lime Creekriver