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 2026-10-13); streamflow classes place each USGS gauge's latest reading against its own day-of-year record.
Health score
72
Moderate
Drought index
110
Moderate
Area in D2+
0%
0% exceptional (D4)
Gauges below normal
33%
of 9 reporting
Median flow
100%
p51 of record
Water assets
3,838
6 springs · 13 wells
USGS gauges (10)
- TRINITY R AB COFFEE C NR TRINITY CENTER CA1152320026 cfsp10 · much below normal
- TRINITY R AB NF TRINITY R NR HELENA CA11526400339 cfsp21 · below normal
- RUSH C NR LEWISTON CA115255302 cfsp21 · below normal
- TRINITY R BL LIMEKILN GULCH NR DOUGLAS CITY CA11525655308 cfsp47 · normal
- INDIAN C NR DOUGLAS CITY CA115256704 cfsp51 · normal
- TRINITY R A HOOPA CA11530000676 cfsp51 · normal
- TRINITY R A JUNCTION CITY CA11526250349 cfsp61 · normal
- TRINITY R A LEWISTON CA11525500310 cfsp72 · normal
- TRINITY R A DOUGLAS CITY CA11525854359 cfsp76 · above normal
- TRINITY R NR BURNT RANCH CA11527000no readingno long-term record
Recent conditions
| Date | DSCI | D2+ % | Gauges low | Flow pct |
|---|---|---|---|---|
| 2026-10-18 | 110 | 0 | 3/9 | p51 |
| 2026-10-17 | 110 | 0 | 1/9 | p54 |
| 2026-10-16 | 110 | 0 | 1/9 | p64 |
| 2026-10-15 | 110 | 0 | 1/9 | p55 |
| 2026-10-14 | 110 | 0 | 1/9 | p48 |
| 2026-10-13 | 110 | 0 | 1/9 | p52 |
| 2026-10-12 | 110 | 0 | 1/9 | p51 |
| 2026-10-11 | 110 | 0 | 1/9 | p50 |
| 2026-10-10 | 110 | 0 | 2/9 | p49 |
| 2026-10-09 | 110 | 0 | 2/9 | p50 |
| 2026-10-08 | 110 | 0 | 2/9 | p49 |
| 2026-10-07 | 110 | 0 | 1/9 | p61 |
| 2026-10-06 | 110 | 0 | 2/9 | p50 |
| 2026-10-05 | 110 | 0 | 1/9 | p57 |
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