Lower San Joaquin River HUC8 18040002
A 2,377 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
60
Moderate
Drought index
1
Abnormally dry
Area in D2+
0%
0% exceptional (D4)
Gauges below normal
100%
of 4 reporting
Median flow
58%
p14 of record
Water assets
1,274
1 springs · 1,260 wells
USGS gauges (4)
- ORESTIMBA C NR NEWMAN CA112745000 cfsp10 · below normal
- DEL PUERTO C NR PATTERSON CA112746300 cfsp10 · below normal
- SAN JOAQUIN R NR NEWMAN CA11274000190 cfsp17 · below normal
- SAN JOAQUIN R NR CROWS LANDING CA11274550262 cfsp24 · below normal
Recent conditions
| Date | DSCI | D2+ % | Gauges low | Flow pct |
|---|---|---|---|---|
| 2026-09-07 | 1 | 0 | 4/4 | p14 |
Top water assets
- 65Del Puerto C Nr Patterson Cariver
- 65San Joaquin R Nr Newman Cariver
- 65San Joaquin R Nr Crows Landing Cariver
- 65Hennings Bros Drilling Co Inc Well — Wcr0002398well
- 64Osterberg And Carroll Well — Wcr0003407well
- 64Osterberg And Carroll Well — Wcr0003384well
- 64Hennings Bros Drilling Co Inc Well — Wcr0001505well
- 64Pearson Well Drilling Well — Wcr0003393well
- 64Osterberg And Stewart Well — Wcr0003439well
- 64Osterberg And Stewart Well — Wcr0002359well