San Pablo Bay HUC8 18050002
A 3,176 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
73
Moderate
Drought index
0
None
Area in D2+
0%
0% exceptional (D4)
Gauges below normal
33%
of 6 reporting
Median flow
192%
p55 of record
Water assets
973
44 springs · 639 wells
USGS gauges (7)
- NAPA R NR ST HELENA CA114560000 cfsp10 · below normal
- SONOMA CREEK A KENWOOD CA114584330 cfsp10 · below normal
- NAPA R NR NAPA CA114580000 cfsp48 · normal
- CORTE MADERA C A ROSS CA114600000 cfsp62 · normal
- SONOMA C A AGUA CALIENTE CA114585001 cfsp74 · normal
- NOVATO C A NOVATO CA114595001 cfsp90 · much above normal
- NATHANSON C A SONOMA CA11458600no readingno long-term record
Recent conditions
| Date | DSCI | D2+ % | Gauges low | Flow pct |
|---|---|---|---|---|
| 2026-09-07 | 0 | 0 | 2/6 | p55 |
Top water assets
- 66Lake Orindareservoir
- 66Veterans Homereservoir
- 65Sonoma C A Agua Caliente Cariver
- 65Corte Madera C A Ross Cariver
- 65Lake Camillereservoir
- 65Sonoma Creek A Kenwood Cariver
- 65Napa R Nr Napa Cariver
- 65Napa R Nr St Helena Cariver
- 65Nathanson Creekriver
- 65Pinole Creekriver