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 2026-09-01); streamflow classes place each USGS gauge's latest reading against its own day-of-year record.
Health score
40
Stressed
Drought index
295
Severe
Area in D2+
95.41%
0% exceptional (D4)
Gauges below normal
100%
of 2 reporting
Median flow
66%
p17 of record
Water assets
942
118 springs · 15 wells
USGS gauges (3)
- BRIGHT ANGEL CREEK NEAR GRAND CANYON, ARIZ.0940300013 cfsp9 · much below normal
- COLORADO RIVER NEAR GRAND CANYON, AZ094025007,280 cfsp25 · below normal
- COLORADO R ABV LITTLE COLORADO R NR DESERT VIEW0938310013,900 cfsno long-term record
Recent conditions
| Date | DSCI | D2+ % | Gauges low | Flow pct |
|---|---|---|---|---|
| 2026-09-07 | 295 | 95.41 | 2/2 | p17 |
Top water assets
- 69Shinumo Washriver
- 69North Canyon Washriver
- 69Bright Angel Creekriver
- 69Bright Angel Creekriver
- 69North Canyon Washriver
- 69North Canyon Washriver
- 69Tanner Washriver
- 69North Canyon Washriver
- 69North Canyon Washriver
- 69North Canyon Washriver