Santa Margarita HUC8 18070302
A 1,919 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
61
Moderate
Drought index
56
Abnormally dry
Area in D2+
0%
0% exceptional (D4)
Gauges below normal
67%
of 12 reporting
Median flow
46%
p10 of record
Water assets
3,041
32 springs · 2,828 wells
USGS gauges (13)
- SANDIA C NR FALLBROOK CA110443500 cfsp7 · much below normal
- TEMECULA C NR AGUANGA CA110424000 cfsp10 · below normal
- WARM SPRINGS C NR MURRIETA CA110428000 cfsp10 · below normal
- SANTA GERTRUDIS C NR TEMECULA CA110429000 cfsp10 · below normal
- DE LUZ C NR DE LUZ CA110448000 cfsp10 · below normal
- ONEILL LK SPILL CH NR FALLBROOK CA110457000 cfsp10 · below normal
- SANTA MARGARITA R A YSIDORA CA110460000 cfsp10 · below normal
- ONEILL LAKE OUTLET CH NR FALLBROOK CA110456000 cfsp18 · below normal
- RAINBOW C NR FALLBROOK CA110442500 cfsp39 · normal
- SANTA MARGARITA R A FPUD SUMP NR FALLBROOK CA110443007 cfsp67 · normal
- SANTA MARGARITA R NR TEMECULA CA110440004 cfsp71 · normal
- FALLBROOK C NR FALLBROOK CA110453000 cfsp90 · much above normal
- MURRIETA C A TEMECULA CA11043000no readingno long-term record
Recent conditions
| Date | DSCI | D2+ % | Gauges low | Flow pct |
|---|---|---|---|---|
| 2026-10-20 | 56 | 0 | 8/12 | p10 |
| 2026-10-19 | 56 | 0 | 7/12 | p10 |
| 2026-10-18 | 56 | 0 | 7/12 | p10 |
| 2026-10-17 | 56 | 0 | 6/12 | p18 |
| 2026-10-16 | 56 | 0 | 6/12 | p19 |
| 2026-10-15 | 56 | 0 | 6/12 | p24 |
| 2026-10-14 | 56 | 0 | 5/12 | p49 |
| 2026-10-13 | 56 | 0 | 4/12 | p77 |
| 2026-10-12 | 56 | 0 | 3/12 | p78 |
| 2026-10-11 | 56 | 0 | 7/12 | p10 |
| 2026-10-10 | 56 | 0 | 10/12 | p10 |
| 2026-10-09 | 56 | 0 | 9/12 | p10 |
| 2026-10-08 | 56 | 0 | 10/12 | p10 |
| 2026-10-07 | 56 | 0 | 8/12 | p10 |
Top water assets
- 67Cahuilla Creekriver
- 67Cahuilla Creekriver
- 67Temecula Creekriver
- 67Chihuahua Creekriver
- 67Cahuilla Creekriver
- 67Wilson Creekriver
- 67Temecula Creekriver
- 67Wilson Creekriver
- 67Arroyo Seco Creekriver
- 67Cahuilla Creekriver