Lower Colorado-Marble Canyon HUC8 15010001
A 3,803 km² sub-basin of the Lower Colorado region in AZ. 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
60
Moderate
Drought index
223
Severe
Area in D2+
27.18%
0% exceptional (D4)
Gauges below normal
50%
of 2 reporting
Median flow
77%
p23 of record
Water assets
942
118 springs · 15 wells
USGS gauges (3)
- COLORADO RIVER NEAR GRAND CANYON, AZ094025006,280 cfsp19 · below normal
- BRIGHT ANGEL CREEK NEAR GRAND CANYON, ARIZ.0940300017 cfsp28 · normal
- COLORADO R ABV LITTLE COLORADO R NR DESERT VIEW0938310013,900 cfsno long-term record
Recent conditions
| Date | DSCI | D2+ % | Gauges low | Flow pct |
|---|---|---|---|---|
| 2026-10-21 | 223 | 27.18 | 1/2 | p23 |
| 2026-10-20 | 223 | 27.18 | 1/2 | p26 |
| 2026-10-19 | 223 | 27.18 | 1/2 | p23 |
| 2026-10-18 | 223 | 27.18 | 1/2 | p33 |
| 2026-10-17 | 223 | 27.18 | 1/2 | p34 |
| 2026-10-16 | 223 | 27.18 | 1/2 | p44 |
| 2026-10-15 | 223 | 27.18 | 1/2 | p51 |
| 2026-10-14 | 223 | 27.18 | 1/2 | p52 |
| 2026-10-13 | 223 | 27.18 | 1/2 | p56 |
| 2026-10-12 | 223 | 27.18 | 1/2 | p53 |
| 2026-10-11 | 223 | 27.18 | 1/2 | p49 |
| 2026-10-10 | 223 | 27.18 | 1/2 | p49 |
| 2026-10-09 | 223 | 27.18 | 1/2 | p50 |
| 2026-10-08 | 245 | 45.05 | 0/2 | p55 |
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