Upper San Pedro HUC8 15050202
A 6,424 km² sub-basin of the Lower Colorado region in AZ, MX. 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
64
Moderate
Drought index
0
None
Area in D2+
0%
0% exceptional (D4)
Gauges below normal
67%
of 9 reporting
Median flow
44%
p10 of record
Water assets
3,097
120 springs · 2,148 wells
USGS gauges (9)
- SAN PEDRO RIVER AT CHARLESTON, AZ094710003 cfsp9 · much below normal
- SAN PEDRO RIVER AT PALOMINAS, AZ.094705000 cfsp10 · below normal
- BANNING CREEK NEAR BISBEE, AZ094707000 cfsp10 · below normal
- UPPER BABOCOMARI RIVER NEAR HUACHUCA CITY, AZ094713800 cfsp10 · below normal
- SAN PEDRO RIVER NEAR TOMBSTONE, AZ094715500 cfsp10 · below normal
- BABOCOMARI RIVER NEAR TOMBSTONE, AZ094714000 cfsp23 · below normal
- HUACHUCA CANYON NEAR FORT HUACHUCA, AZ094713100 cfsp83 · above normal
- GARDEN CANYON NEAR FORT HUACHUCA, AZ094708003 cfsp94 · much above normal
- RAMSEY CANYON NEAR SIERRA VISTA, AZ094707503 cfsp96 · much above normal
Recent conditions
| Date | DSCI | D2+ % | Gauges low | Flow pct |
|---|---|---|---|---|
| 2026-10-21 | 0 | 0 | 6/9 | p10 |
| 2026-10-20 | 0 | 0 | 5/9 | p14 |
| 2026-10-19 | 0 | 0 | 6/9 | p13 |
| 2026-10-18 | 0 | 0 | 6/9 | p11 |
| 2026-10-17 | 0 | 0 | 6/9 | p15 |
| 2026-10-16 | 0 | 0 | 5/9 | p22 |
| 2026-10-15 | 0 | 0 | 4/9 | p27 |
| 2026-10-14 | 0 | 0 | 4/9 | p29 |
| 2026-10-13 | 0 | 0 | 4/9 | p25 |
| 2026-10-12 | 0 | 0 | 4/9 | p32 |
| 2026-10-11 | 0 | 0 | 4/9 | p37 |
| 2026-10-10 | 0 | 0 | 4/9 | p32 |
| 2026-10-09 | 0 | 0 | 3/9 | p36 |
| 2026-10-08 | 0 | 0 | 5/9 | p10 |
Top water assets
- 67San Pedro Riverriver
- 67San Pedro Riverriver
- 67Babocomari Riverriver
- 67Clifford Washriver
- 67Dragoon Washriver
- 67San Pedro Riverriver
- 67Tres Alamos Washriver
- 67San Pedro River At Charleston, Azriver
- 67San Pedro Riverriver
- 67San Pedro Riverriver