San Joaquin Delta HUC8 18040003
A 3,192 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
3
Abnormally dry
Area in D2+
0%
0% exceptional (D4)
Gauges below normal
100%
of 1 reporting
Median flow
60%
p23 of record
Water assets
1,872
0 springs · 1,812 wells
USGS gauges (16)
- SAN JOAQUIN R NR VERNALIS CA11303500709 cfsp23 · below normal
- SAN JOAQUIN R BL GARWOOD BRIDGE A STOCKTON CA11304810-980 cfsno long-term record
- TURNER CUT NR HOLT CA11311300no readingno long-term record
- MIDDLE R AT MIDDLE RIVER CA11312676no readingno long-term record
- MIDDLE R NR HOLT CA11312685no readingno long-term record
- OLD R NR DELTA MENDOTA CANAL CA11312968133 cfsno long-term record
- GRANT LINE CN NR TRACY CA11313240-39 cfsno long-term record
- OLD RIVER NEAR BYRON CA11313315no readingno long-term record
- OLD R A BACON ISLAND CA11313405no readingno long-term record
- HOLLAND CUT NR BETHEL ISLAND CA113134317,790 cfsno long-term record
- DUTCH SLOUGH BL JERSEY ISLAND RD A JERSEY ISLAND113134333,130 cfsno long-term record
- OLD R A QUIMBY ISLAND NR BETHEL ISLAND CA113134342,760 cfsno long-term record
- FALSE R NR OAKLEY CA1131344013,000 cfsno long-term record
- OLD R A FRANKS TRACT NR TERMINOUS CA11313452no readingno long-term record
- SAN JOAQUIN R A PRISONERS PT NR TERMINOUS CA11313460no readingno long-term record
- SAN JOAQUIN R A JERSEY POINT CA113371902,920 cfsno long-term record
Recent conditions
| Date | DSCI | D2+ % | Gauges low | Flow pct |
|---|---|---|---|---|
| 2026-09-07 | 3 | 0 | 1/1 | p23 |
Top water assets
- 65False R Nr Oakley Cariver
- 65Bear Creekriver
- 65San Joaquin R Nr Vernalis Cariver
- 65San Joaquin Riverriver
- 65Holland Cut Nr Bethel Island Cariver
- 65Dutch Slough Bl Jersey Island Rd A Jersey Islandriver
- 65Old R A Quimby Island Nr Bethel Island Cariver
- 64Antioch Brackish Water Desalreservoir
- 54002N006E08N001Mwell
- 54002N006E29H001Mwell