Upper Stony HUC8 18020115
A 2,012 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
72
Moderate
Drought index
100
Moderate
Area in D2+
0%
0% exceptional (D4)
Gauges below normal
—
no gauges reporting
Median flow
—
of normal for the date
Water assets
469
0 springs · 15 wells
USGS gauges (0)
No active discharge gauges in this sub-basin.
Recent conditions
| Date | DSCI | D2+ % | Gauges low | Flow pct |
|---|---|---|---|---|
| 2026-09-07 | 100 | 0 | — | — |
Top water assets
- 69Middle Fork Stony Creekriver
- 67South Fork Elk Creekriver
- 67Grindstone Creekriver
- 67Grindstone Creekriver
- 67Grindstone Creekriver
- 67Little Sullivan Creekriver
- 67Harvey Spring Creekriver
- 67Mill Creekriver
- 67Stony Gorge Damreservoir
- 67Little Stony Creekriver