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 2026-10-13); streamflow classes place each USGS gauge's latest reading against its own day-of-year record.
Health score
66
Moderate
Drought index
0
None
Area in D2+
0%
0% exceptional (D4)
Gauges below normal
71%
of 7 reporting
Median flow
18%
p10 of record
Water assets
973
44 springs · 639 wells
USGS gauges (7)
- NAPA R NR ST HELENA CA114560000 cfsp10 · below normal
- NAPA R NR NAPA CA114580000 cfsp10 · below normal
- SONOMA CREEK A KENWOOD CA114584330 cfsp10 · below normal
- NATHANSON C A SONOMA CA114586000 cfsp10 · below normal
- CORTE MADERA C A ROSS CA114600000 cfsp23 · below normal
- SONOMA C A AGUA CALIENTE CA114585001 cfsp47 · normal
- NOVATO C A NOVATO CA114595002 cfsp94 · much above normal
Recent conditions
| Date | DSCI | D2+ % | Gauges low | Flow pct |
|---|---|---|---|---|
| 2026-10-20 | 0 | 0 | 5/7 | p10 |
| 2026-10-19 | 0 | 0 | 4/7 | p10 |
| 2026-10-18 | 0 | 0 | 4/7 | p10 |
| 2026-10-17 | 0 | 0 | 4/7 | p10 |
| 2026-10-16 | 0 | 0 | 4/7 | p10 |
| 2026-10-15 | 0 | 0 | 4/7 | p10 |
| 2026-10-14 | 0 | 0 | 4/7 | p10 |
| 2026-10-13 | 0 | 0 | 4/7 | p10 |
| 2026-10-12 | 0 | 0 | 4/7 | p10 |
| 2026-10-11 | 0 | 0 | 4/7 | p10 |
| 2026-10-10 | 0 | 0 | 4/7 | p10 |
| 2026-10-09 | 0 | 0 | 4/7 | p10 |
| 2026-10-08 | 0 | 0 | 4/7 | p10 |
| 2026-10-07 | 0 | 0 | 4/7 | p10 |
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