Bill Williams HUC8 15030204
A 2,783 km² sub-basin of the Lower Colorado region in AZ. 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
51
Moderate
Drought index
200
Severe
Area in D2+
0%
0% exceptional (D4)
Gauges below normal
100%
of 2 reporting
Median flow
22%
p13 of record
Water assets
531
3 springs · 173 wells
USGS gauges (2)
- BILL WILLIAMS RIVER NEAR PARKER, AZ094266200 cfsp10 · below normal
- BILL WILLIAMS RIVER BELOW ALAMO DAM, AZ0942600011 cfsp17 · below normal
Recent conditions
| Date | DSCI | D2+ % | Gauges low | Flow pct |
|---|---|---|---|---|
| 2026-09-07 | 200 | 0 | 2/2 | p13 |
Top water assets
- 67Bullard Washriver
- 67Bullard Washriver
- 67Bullard Washriver
- 67Bullard Washriver
- 67Bullard Washriver
- 67Bullard Washriver
- 67Bullard Washriver
- 67Bullard Washriver
- 67Alamo Damreservoir
- 67Bullard Washriver