San Gabriel HUC8 18070106
A 2,347 km² sub-basin of the California region in CA. 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
68
Moderate
Drought index
0
None
Area in D2+
0%
0% exceptional (D4)
Gauges below normal
40%
of 5 reporting
Median flow
729%
p70 of record
Water assets
1,019
6 springs · 906 wells
USGS gauges (5)
- CARBON C BL CARBON CYN DAM CA110757200 cfsp10 · below normal
- SAN GABRIEL R BL SANTA FE DAM NR BALDWIN PK CA110850000 cfsp10 · below normal
- SAN GABRIEL R AB WHITTIER NARROWS DAM CA1108702074 cfsp70 · normal
- BREA C BL BREA DAM NR FULLERTON CA110885003 cfsp94 · much above normal
- FULLERTON C BL FULLERTON DAM NR BREA CA110895002 cfsp95 · much above normal
Recent conditions
| Date | DSCI | D2+ % | Gauges low | Flow pct |
|---|---|---|---|---|
| 2026-09-07 | 0 | 0 | 2/5 | p70 |
Top water assets
- 67San Gabriel Riverriver
- 67West Fork San Gabriel Riverriver
- 67West Fork Bear Creekriver
- 67San Gabriel Riverriver
- 67Puddingstonereservoir
- 67San Gabriel Riverriver
- 67San Gabrielreservoir
- 67Bear Creekriver
- 67Iron Forkriver
- 67North Fork San Gabriel Riverriver