Fortymile River HUC8 19070502
A 16,818 km² sub-basin of the Alaska region in AK, CN. 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
59
Moderate
Drought index
63
Abnormally dry
Area in D2+
0%
0% exceptional (D4)
Gauges below normal
100%
of 1 reporting
Median flow
54%
p16 of record
Water assets
45
42 springs · 1 wells
USGS gauges (2)
- FORTYMILE R NR STEELE CREEK AK153480001,440 cfsp16 · below normal
- WADE C TRIB NR CHICKEN AK15320100no readingno long-term record
Recent conditions
| Date | DSCI | D2+ % | Gauges low | Flow pct |
|---|---|---|---|---|
| 2026-09-07 | 63 | 0 | 1/1 | p16 |
Top water assets
- 53Surface Water — Adlspring
- 53Groundwater — Adlwell
- 53Surface Water — Adlspring
- 53Surface Water — Adlspring
- 53Surface Water — Adlspring
- 53Surface Water — Adlspring
- 53Surface Water — Lasspring
- 53Surface Water — Lasspring
- 53Surface Water — Lasspring
- 53Surface Water — Lasspring