Upper Chehalis HUC8 17100103
A 3,364 km² sub-basin of the Pacific Northwest region in 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
78
Healthy
Drought index
6
Abnormally dry
Area in D2+
0%
0% exceptional (D4)
Gauges below normal
0%
of 8 reporting
Median flow
107%
p56 of record
Water assets
4,994
25 springs · 4,886 wells
USGS gauges (12)
- SKOOKUMCHUCK RIVER BL BLDY RUN CR NR CENTRALIA, WA12026150106 cfsp32 · normal
- CHEHALIS RIVER NEAR DOTY, WA1202000033 cfsp44 · normal
- NEWAUKUM RIVER NEAR CHEHALIS, WA1202500047 cfsp53 · normal
- SKOOKUMCHUCK RIVER NEAR VAIL, WA1202570026 cfsp54 · normal
- CHEHALIS RIVER AT PORTER, WA12031000428 cfsp59 · normal
- CHEHALIS RIVER NEAR GRAND MOUND, WA12027500292 cfsp66 · normal
- SKOOKUMCHUCK RIVER NEAR BUCODA, WA12026400126 cfsp75 · above normal
- CHEHALIS RIVER NEAR ADNA, WA1202180082 cfsp84 · above normal
- ELK CREEK BELOW DEER CREEK NEAR DOTY, WA1202052586 cfsno long-term record
- SOUTH FORK CHEHALIS RIVER NEAR WILDWOOD, WA1202080040 cfsno long-term record
- SOUTH FORK NEWAUKUM RIVER NEAR ONALASKA, WA12024000no readingno long-term record
- NF NEWAUKUM RIVER ABOVE BEAR CREEK NEAR FOREST, WA12024400no readingno long-term record
Recent conditions
| Date | DSCI | D2+ % | Gauges low | Flow pct |
|---|---|---|---|---|
| 2026-09-07 | 6 | 0 | 0/8 | p56 |
Top water assets
- 76Ir — Ap S2-30113spring
- 76Mu — Ap S2-30405spring
- 76Ir — Ap S2-29380spring
- 67Skookumchuckreservoir
- 66Ir — Ap S2-29760spring
- 66Ds Po — Ap S2-29167spring
- 66Ir St — Ap S2-29762spring
- 66Ir — Ap S2-29614spring
- 65Centralia Coal Mine Pond 46 Damreservoir
- 65Centralia Coal Mine Dam No 3Breservoir