Lower Colorado HUC8 15030107
A 3,993 km² sub-basin of the Lower Colorado region in AZ, CA, 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
54
Moderate
Drought index
200
Severe
Area in D2+
0%
0% exceptional (D4)
Gauges below normal
43%
of 23 reporting
Median flow
88%
p34 of record
Water assets
1,885
0 springs · 1,573 wells
USGS gauges (25)
- PONTIAC CANAL NEAR YUMA, AZ095238000 cfsp0 · much below normal
- NORTH GILA MAIN CANAL NO. 2 NEAR YUMA, AZ095226501 cfsp3 · much below normal
- NORTH GILA MAIN CANAL NEAR YUMA, AZ0952260019 cfsp4 · much below normal
- RESERVATION MAIN CANAL NEAR YUMA, AZ0952320024 cfsp6 · much below normal
- DIVERSION FROM YUMA MAIN CANAL FOR YUMA MUNICIPAL0952600017 cfsp8 · much below normal
- YUMA MAIN CANAL ABOVE WASTEWAY NR WINTERHAVEN, CA09524700491 cfsp8 · much below normal
- COLORADO R BLW YUMA MAIN CANAL WW AT YUMA, AZ09521100548 cfsp9 · much below normal
- COCOPAH DIVERSION FROM WEST MAIN CANAL NR SOMERTON095282000 cfsp10 · below normal
- YUMA MAIN CANAL AT SIPHON DROP P.P. NR YUMA, AZ09524000501 cfsp15 · below normal
- ALL-AMERICAN CANAL NR IMPERIAL DAM, CA-AZ095230004,860 cfsp24 · below normal
- YUMA MAIN CANAL WASTEWAY AT YUMA, AZ09525000108 cfsp32 · normal
- MITTRY LAKE DIVERSION AT IMPERIAL DAM, AZ0952240011 cfsp34 · normal
- COLORADO RIVER BELOW LAGUNA DAM, AZ-CA09429600369 cfsp36 · normal
- DRAIN 8-B NEAR WINTERHAVEN, CA0953050013 cfsp38 · normal
- RESERVATION MAIN DRAIN NO. 4 NEAR YUMA, AZ0953000065 cfsp55 · normal
- YUMA MESA OUTLET DRAIN NEAR YUMA, AZ0953020041 cfsp61 · normal
- YAQUI CANAL NEAR YUMA, AZ0952360016 cfsp64 · normal
- GILA DRAIN NO. 1 NEAR YUMA, AZ095290008 cfsp68 · normal
- GILA GRAVITY MAIN CANAL AT IMPERIAL DAM, AZ-CA095225001,100 cfsp75 · above normal
- CITY OF YUMA INFLOW TO SEWAGE TREATMENT PLANT0953010014 cfsp78 · above normal
- SOUTH GILA TERMINAL CANAL WASTEWAY NR YUMA, AZ095294206 cfsp82 · above normal
- YPSILANTI CANAL NEAR WINTERHAVEN, CA0952620052 cfsp84 · above normal
- LEVEE CANAL WASTEWAY NEAR YUMA, AZ095288006 cfsp85 · above normal
- COLORADO RIVER BELOW IMPERIAL DAM, AZ-CA09429500245 cfsno long-term record
- COLORADO RVR ABV OCEAN TO OCEAN BRIDGE NR YUMA, AZ095209002,140 cfsno long-term record
Recent conditions
| Date | DSCI | D2+ % | Gauges low | Flow pct |
|---|---|---|---|---|
| 2026-10-20 | 200 | 0 | 10/23 | p34 |
| 2026-10-19 | 200 | 0 | 13/23 | p10 |
| 2026-10-18 | 200 | 0 | 13/23 | p19 |
| 2026-10-17 | 200 | 0 | 13/23 | p19 |
| 2026-10-16 | 200 | 0 | 11/23 | p25 |
| 2026-10-15 | 200 | 0 | 14/23 | p13 |
| 2026-10-14 | 200 | 0 | 12/23 | p16 |
| 2026-10-13 | 200 | 0 | 14/23 | p16 |
| 2026-10-12 | 200 | 0 | 13/23 | p19 |
| 2026-10-11 | 200 | 0 | 15/23 | p13 |
| 2026-10-10 | 200 | 0 | 10/23 | p34 |
| 2026-10-09 | 200 | 0 | 14/23 | p21 |
| 2026-10-08 | 200 | 0 | 13/23 | p17 |
| 2026-10-07 | 200 | 0 | 15/23 | p18 |
Top water assets
- 66Laguna Diversion Damreservoir
- 65Colorado Rvr Abv Ocean To Ocean Bridge Nr Yuma, Azriver
- 65Yuma Main Canal Blw Colorado R. Siphon At Yuma, Azriver
- 65Yuma Main Canal At Siphon Drop P.P. Nr Yuma, Azriver
- 65Yuma Main Canal Wasteway At Yuma, Azriver
- 65Yuma Main Canal Above Wasteway Nr Winterhaven, Cariver
- 65South Gila Terminal Canal Wasteway Nr Yuma, Azriver
- 65Levee Canal Wasteway Near Yuma, Azriver
- 65Colorado River Below Laguna Dam, Az-Cariver
- 65North Gila Main Canal Near Yuma, Azriver