Middle San Joaquin-Lower Chowchilla HUC8 18040001
A 9,130 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
78
Healthy
Drought index
33
Abnormally dry
Area in D2+
0%
0% exceptional (D4)
Gauges below normal
0%
of 5 reporting
Median flow
70%
p33 of record
Water assets
5,339
6 springs · 4,621 wells
USGS gauges (6)
- SALT SLOUGH A HWY 165 NR STEVINSON CA1126110082 cfsp29 · normal
- SAN JOAQUIN R A FREMONT FORD BRIDGE CA1126150099 cfsp29 · normal
- SAN JOAQUIN R AB MERCED R NR NEWMAN CA11273400152 cfsp33 · normal
- MUD SLOUGH NR GUSTINE CA1126290069 cfsp37 · normal
- SAN JOAQUIN R BL FRIANT CA11251000392 cfsp73 · normal
- SAN JOAQUIN R NR MENDOTA CA11254000153 cfsno long-term record
Recent conditions
| Date | DSCI | D2+ % | Gauges low | Flow pct |
|---|---|---|---|---|
| 2026-10-19 | 33 | 0 | 0/5 | p33 |
| 2026-10-18 | 33 | 0 | 2/5 | p31 |
| 2026-10-17 | 33 | 0 | 1/5 | p31 |
| 2026-10-16 | 33 | 0 | 1/5 | p33 |
| 2026-10-15 | 33 | 0 | 1/5 | p34 |
| 2026-10-14 | 33 | 0 | 1/5 | p37 |
| 2026-10-13 | 33 | 0 | 1/5 | p37 |
| 2026-10-12 | 33 | 0 | 0/5 | p35 |
| 2026-10-11 | 33 | 0 | 1/5 | p37 |
| 2026-10-10 | 33 | 0 | 0/5 | p36 |
| 2026-10-09 | 33 | 0 | 0/5 | p35 |
| 2026-10-08 | 33 | 0 | 0/5 | p34 |
| 2026-10-07 | 33 | 0 | 0/5 | p41 |
| 2026-10-06 | 33 | 0 | 1/5 | p35 |
Top water assets
- 67Oliver Creekriver
- 67De Long Creekriver
- 67West Fork Chowchilla Riverriver
- 67East Fork Chowchilla Riverriver
- 67Oliver Creekriver
- 67Little Panoche Detentionreservoir
- 67B.F. Sisk Damreservoir
- 67Los Banos Creek Detention Damreservoir
- 67Buchanan Damreservoir
- 67Mariposa Creekriver