Snohomish HUC8 17110011
A 769 km² sub-basin of the Pacific Northwest region in WA. 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
48
Stressed
Drought index
111
Moderate
Area in D2+
0%
0% exceptional (D4)
Gauges below normal
100%
of 2 reporting
Median flow
30%
p9 of record
Water assets
1,488
193 springs · 1,086 wells
USGS gauges (3)
- PILCHUCK RIVER NEAR SNOHOMISH, WA1215530052 cfsp6 · much below normal
- SNOHOMISH RIVER NEAR MONROE, WA121508001,860 cfsp11 · below normal
- SNOHOMISH RIVER AT SNOHOMISH, WA12155500no readingno long-term record
Recent conditions
| Date | DSCI | D2+ % | Gauges low | Flow pct |
|---|---|---|---|---|
| 2026-10-22 | 111 | 0 | 2/2 | p9 |
| 2026-10-21 | 111 | 0 | 2/2 | p8 |
| 2026-10-20 | 111 | 0 | 2/2 | p9 |
| 2026-10-19 | 111 | 0 | 2/2 | p11 |
| 2026-10-18 | 111 | 0 | 2/2 | p10 |
| 2026-10-17 | 111 | 0 | 2/2 | p12 |
| 2026-10-16 | 111 | 0 | 2/2 | p9 |
| 2026-10-15 | 111 | 0 | 2/2 | p11 |
| 2026-10-14 | 111 | 0 | 2/2 | p12 |
| 2026-10-13 | 111 | 0 | 2/2 | p15 |
| 2026-10-12 | 111 | 0 | 1/2 | p21 |
| 2026-10-11 | 111 | 0 | 1/2 | p27 |
| 2026-10-10 | 111 | 0 | 2/2 | p14 |
| 2026-10-09 | 111 | 0 | 2/2 | p13 |
Top water assets
- 73Ir — Ce S1-*10823Alcwrisspring
- 73Ir — Ce S1-*20111Cwrisspring
- 66Ir — Ce S1-*11129Alcwrisspring
- 66Ir — Ce S1-*11903Cwrisspring
- 66Dm Ir — Ce S1-*08609Cwrisspring
- 66Ir — Ce S1-*10952Cwrisspring
- 66Ir — Ce S1-*06318Cwrisspring
- 66Ir — Ce S1-*04354Cwrisspring
- 66Fs — Ce S1-*02706Cwrisspring
- 66Ir — Ce S1-*10442Cwrisspring