Trinity HUC8 18010211
A 5,278 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
76
Healthy
Drought index
125
Moderate
Area in D2+
0%
0% exceptional (D4)
Gauges below normal
0%
of 10 reporting
Median flow
216%
p80 of record
Water assets
3,838
6 springs · 13 wells
USGS gauges (10)
- TRINITY R AB COFFEE C NR TRINITY CENTER CA1152320033 cfsp37 · normal
- RUSH C NR LEWISTON CA115255302 cfsp69 · normal
- INDIAN C NR DOUGLAS CITY CA115256705 cfsp76 · above normal
- TRINITY R A JUNCTION CITY CA115262501,120 cfsp78 · above normal
- TRINITY R A DOUGLAS CITY CA115258541,170 cfsp79 · above normal
- TRINITY R AB NF TRINITY R NR HELENA CA115264001,140 cfsp80 · above normal
- TRINITY R BL LIMEKILN GULCH NR DOUGLAS CITY CA115256551,190 cfsp82 · above normal
- TRINITY R A HOOPA CA115300001,370 cfsp85 · above normal
- TRINITY R NR BURNT RANCH CA115270001,260 cfsp87 · above normal
- TRINITY R A LEWISTON CA115255001,170 cfsp90 · above normal
Recent conditions
| Date | DSCI | D2+ % | Gauges low | Flow pct |
|---|---|---|---|---|
| 2026-09-07 | 125 | 0 | 0/10 | p80 |
Top water assets
- 69Lick Creekriver
- 69Deadfall Creekriver
- 69Union Creekriver
- 69Tamarack Creekriver
- 69Deep Creekriver
- 69Bear Creekriver
- 69Middle Fork Rattlesnake Creekriver
- 69Trinity Damreservoir
- 69Rattlesnake Creekriver
- 69High Camp Creekriver