Upper Cosumnes HUC8 18040013
A 2,460 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
71
Moderate
Drought index
80
Abnormally dry
Area in D2+
0%
0% exceptional (D4)
Gauges below normal
0%
of 1 reporting
Median flow
731%
p90 of record
Water assets
373
0 springs · 295 wells
USGS gauges (1)
- COSUMNES R A MICHIGAN BAR CA1133500059 cfsp90 · above normal
Recent conditions
| Date | DSCI | D2+ % | Gauges low | Flow pct |
|---|---|---|---|---|
| 2026-09-07 | 80 | 0 | 0/1 | p90 |
Top water assets
- 69Camp Creekriver
- 69Prothro Creekriver
- 69Camp Creekriver
- 67Sly Park Creekriver
- 67Scott Creekriver
- 67Salt Rock Creekriver
- 67Middle Fork Cosumnes Riverriver
- 67South Fork Cosumnes Riverriver
- 67Scott Creekriver
- 67Sopiago Creekriver