Upper Mokelumne HUC8 18040012
A 3,280 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
66
Moderate
Drought index
76
Abnormally dry
Area in D2+
0%
0% exceptional (D4)
Gauges below normal
0%
of 1 reporting
Median flow
—
p100 of record
Water assets
1,005
3 springs · 590 wells
USGS gauges (7)
- DRY C NR GALT CA113295001 cfsp100 · much above normal
- DELTA CROSS CHANNEL NR WALNUT GROVE113366002,030 cfsno long-term record
- S MOKELUMNE R A NEW HOPE BR NR WALNUT GROVE CA11336680-585 cfsno long-term record
- N MOKELUMNE NR WALNUT GROVE CA11336685306 cfsno long-term record
- LITTLE POTATO SLOUGH A TERMINOUS CA11336790-107 cfsno long-term record
- MOKELUMNE R A ANDRUS ISLAND NR TERMINOUS CA113369301,480 cfsno long-term record
- GEORGIANA SLOUGH NR SACRAMENTO R114479031,480 cfsno long-term record
Recent conditions
| Date | DSCI | D2+ % | Gauges low | Flow pct |
|---|---|---|---|---|
| 2026-10-19 | 76 | 0 | 0/1 | p100 |
| 2026-10-18 | 76 | 0 | 0/1 | p100 |
| 2026-10-17 | 76 | 0 | 0/1 | p100 |
| 2026-10-16 | 76 | 0 | 0/1 | p100 |
| 2026-10-15 | 76 | 0 | 0/1 | p100 |
| 2026-10-14 | 76 | 0 | 0/1 | p100 |
| 2026-10-13 | 76 | 0 | 0/1 | p100 |
| 2026-10-12 | 76 | 0 | 0/1 | p100 |
| 2026-10-11 | 76 | 0 | 0/1 | p100 |
| 2026-10-10 | 76 | 0 | 0/1 | p100 |
| 2026-10-09 | 76 | 0 | 0/1 | p100 |
| 2026-10-08 | 76 | 0 | 0/1 | p100 |
| 2026-10-07 | 76 | 0 | 0/1 | p100 |
| 2026-10-06 | 76 | 0 | 0/1 | p100 |
Top water assets
- 69Summit City Creekriver
- 69Cache Creekriver
- 69Middle Creekriver
- 69Meadow Creekriver
- 69Deer Creekriver
- 69Summit City Creekriver
- 69Summit City Creekriver
- 69Blue Creekriver
- 69North Fork Mokelumne Riverriver
- 69Summit City Creekriver