San Diego HUC8 18070304

A 4,022 km² sub-basin of the California region in 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

Moderate

Drought index

Abnormally dry

Area in D2+

0% exceptional (D4)

Gauges below normal

60%

of 10 reporting

Median flow

487%

p10 of record

Water assets

986

24 springs · 647 wells

USGS gauges (12)

LOS COCHES C NR LAKESIDE CA
110222000 cfsp6 · much below normal
SWEETWATER R NR DESCANSO CA
110150000 cfsp10 · below normal
SWEETWATER R A DEHESA CA
110162000 cfsp10 · below normal
SANTA YSABEL C NR RAMONA CA
110255000 cfsp10 · below normal
GUEJITO C NR SAN PASQUAL CA
110270000 cfsp10 · below normal
SANTA MARIA C NR RAMONA CA
110285000 cfsp10 · below normal
JAMUL C NR JAMUL CA
110140000 cfsp51 · normal
LOS PENASQUITOS C NR POWAY CA
110233403 cfsp82 · above normal
SAN DIEGO R A MAST RD NR SANTEE CA
110224807 cfsp91 · much above normal
SAN DIEGO R A FASHION VALLEY AT SAN DIEGO CA
1102300014 cfsp93 · much above normal
ALVARADO C NR LA MESA CA
110228300 cfsno long-term record
TECOLOTE C AB FOOTBRIDGE NR SAN DIEGO CA
110231000 cfsno long-term record

Recent conditions

Date	DSCI	Gauges low	Flow pct
2026-10-20	49	6/10	p10
2026-10-19	49	5/10	p25
2026-10-18	49	5/10	p24
2026-10-17	49	5/10	p24
2026-10-16	49	5/10	p27
2026-10-15	49	5/10	p32
2026-10-14	49	5/10	p32
2026-10-13	49	5/10	p37
2026-10-12	49	5/10	p40
2026-10-11	49	3/10	p92
2026-10-10	49	6/10	p13
2026-10-09	49	6/10	p15
2026-10-08	49	6/10	p13
2026-10-07	49	6/10	p13

Top water assets

View on the map All California sub-basins