Santa Ana HUC8 18070203
A 4,388 km² sub-basin of the California region in CA. 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
71
Moderate
Drought index
0
None
Area in D2+
0%
0% exceptional (D4)
Gauges below normal
30%
of 27 reporting
Median flow
95%
p44 of record
Water assets
2,719
46 springs · 2,422 wells
USGS gauges (29)
- WARM C NR SAN BERNARDINO CA110604000 cfsp0 · much below normal
- TEMESCAL C AB MAIN ST A CORONA CA110721000 cfsp0 · much below normal
- SANTA ANA R NR MENTONE (RIVER ONLY) CA110514990 cfsp10 · below normal
- FONTANA PH FOREBAY SPILLWAY NR FONTANA CA110624500 cfsp10 · below normal
- FONTANA WATER CO SPILL CH FROM AFTERBAY NR FONTANA110628000 cfsp10 · below normal
- TEMESCAL C A CORONA LK NR CORONA CA110719000 cfsp10 · below normal
- SANTIAGO C A SANTA ANA CA110775000 cfsp10 · below normal
- SANTA ANA R A SANTA ANA CA110780000 cfsp10 · below normal
- SAN ANTONIO C A RIVERSIDE DRIVE NR CHINO CA110733000 cfsp26 · normal
- SAN TIMOTEO C NR LOMA LINDA CA110575000 cfsp27 · normal
- SANTA ANA R A MWD CROSSING CA1106646041 cfsp35 · normal
- E TWIN C NR ARROWHEAD SPRINGS CA110585001 cfsp41 · normal
- CHINO C A SCHAEFER AVENUE NR CHINO CA110733601 cfsp44 · normal
- SAR SUPP GAGE NR MENTONE CA110515022 cfsp44 · normal
- SANTA ANA R BL PRADO DAM CA1107400099 cfsp51 · normal
- CUCAMONGA C NR UPLAND CA110734703 cfsp56 · normal
- CAJON C BL LONE PINE C NR KEENBROOK CA110635104 cfsp59 · normal
- WATERMAN CANYON CREEK NR ARROWHEAD SPRINGS CA110586001 cfsp59 · normal
- CITY C NR HIGHLAND CA110558002 cfsp71 · normal
- SANTA ANA R A E ST NR SAN BERNARDINO CA110593008 cfsp86 · above normal
- DEVIL CYN C NR SAN BERNARDINO CA110636802 cfsp86 · above normal
- FONTANA WATER CO SURFACE DIV WEIR 2 NR FONTANA CA110623999 cfsp91 · much above normal
- FONTANA WATER CO SURFACE DIV NR FONTANA CA1106240010 cfsp91 · much above normal
- PLUNGE C NR EAST HIGHLANDS CA110555006 cfsp98 · much above normal
- LYTLE C A COLTON CA110650001 cfsp98 · much above normal
- LYTLE C NR FONTANA CA1106200026 cfsp99 · much above normal
- CUCAMONGA C NR MIRA LOMA CA110734951,560 cfsp99 · much above normal
- LYTLE C DIV TO FONTANA PH AVM NR FONTANA CA1106270012 cfsno long-term record
- COLDWATER CANYON C NR CORONA CA110717600 cfsno long-term record
Recent conditions
| Date | DSCI | D2+ % | Gauges low | Flow pct |
|---|---|---|---|---|
| 2026-10-21 | 0 | 0 | 8/27 | p44 |
| 2026-10-20 | 0 | 0 | 7/27 | p48 |
| 2026-10-19 | 0 | 0 | 8/27 | p50 |
| 2026-10-18 | 0 | 0 | 8/27 | p50 |
| 2026-10-17 | 0 | 0 | 9/27 | p49 |
| 2026-10-16 | 0 | 0 | 10/27 | p55 |
| 2026-10-15 | 0 | 0 | 10/27 | p62 |
| 2026-10-14 | 0 | 0 | 8/27 | p81 |
| 2026-10-13 | 0 | 0 | 7/26 | p86 |
| 2026-10-12 | 0 | 0 | 4/27 | p89 |
| 2026-10-11 | 0 | 0 | 7/27 | p56 |
| 2026-10-10 | 0 | 0 | 11/27 | p44 |
| 2026-10-09 | 0 | 0 | 12/27 | p40 |
| 2026-10-08 | 0 | 0 | 10/27 | p48 |
Top water assets
- 69Santa Ana Riverriver
- 69Santa Ana Riverriver
- 69Santa Ana Riverriver
- 69Cienaga Seca Creekriver
- 69Santa Ana Riverriver
- 69Bear Creekriver
- 69Santa Ana Riverriver
- 69Santa Ana Riverriver
- 69North Fork Lytle Creekriver
- 69South Fork Lytle Creekriver