Sumas River HUC8 17110001
A 1,622 km² sub-basin of the Pacific Northwest region in CN, WA. 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
56
Moderate
Drought index
199
Moderate
Area in D2+
0%
0% exceptional (D4)
Gauges below normal
—
no gauges reporting
Median flow
—
of normal for the date
Water assets
928
141 springs · 333 wells
USGS gauges (1)
- SUMAS RIVER NEAR SUMAS, WA12214500no readingno long-term record
Recent conditions
| Date | DSCI | D2+ % | Gauges low | Flow pct |
|---|---|---|---|---|
| 2026-09-07 | 199 | 0 | — | — |
Top water assets
- 76Ir — Ap S1-27696spring
- 73Ir — Ap S1-27981spring
- 73Ds Po St — Ce S1-*03351Cwrisspring
- 69Depot Creekriver
- 67Quartz Creekriver
- 67Bear Creekriver
- 67Middle Fork Silesia Creekriver
- 67Indian Creekriver
- 67Silesia Creekriver
- 67Middle Fork Silesia Creekriver