Lower Sacramento HUC8 18020163
A 3,182 km² sub-basin of the California region in CA. 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
75
Healthy
Drought index
46
Abnormally dry
Area in D2+
0%
0% exceptional (D4)
Gauges below normal
0%
of 2 reporting
Median flow
114%
p64 of record
Water assets
1,636
0 springs · 1,510 wells
USGS gauges (18)
- YOLO BYPASS NR WOODLAND CA1145300047 cfsp52 · normal
- SACRAMENTO R A FREEPORT CA1144765018,400 cfsp76 · above normal
- LAGUNA C NR ELK GROVE CA113365851 cfsno long-term record
- THREEMILE SLOUGH NR RIO VISTA CA11337080no readingno long-term record
- SUTTER SLOUGH A COURTLAND CA114478303,600 cfsno long-term record
- STEAMBOAT SLOUGH NR WALNUT GROVE CA114478503,680 cfsno long-term record
- SACRAMENTO R AB DELTA CROSS CHANNEL CA114478909,790 cfsno long-term record
- SACRAMENTO R BL GEORGIANA SLOUGH CA11447905no readingno long-term record
- CACHE C OVERFLOW WEIR FROM SETTLING BAS NR WOOD'LD114528000 cfsno long-term record
- CACHE C OUTFLOW FROM SETTLING BASIN NR WOODLAND CA114529003 cfsno long-term record
- TOE DRAIN A LIBERTY ISLAND NR COURTLAND CA11455140-949 cfsno long-term record
- SHAG SLOUGH A LIBERTY ISLAND NR COURTLAND CA11455276no readingno long-term record
- CACHE SLOUGH AB RYER ISLAND FERRY NR RIO VISTA CA114553856,770 cfsno long-term record
- SACRAMENTO R A RIO VISTA CA11455420no readingno long-term record
- SACRAMENTO R BL WALNUT GROVE BR A WALNUT GROVE CA381427121305401no readingno long-term record
- NEMETH SLOUGH NR COURTLAND CA381807121413801-324 cfsno long-term record
- GREEN SLOUGH NR COURTLAND CA381905121413901-457 cfsno long-term record
- LIBERTY ISLAND A LOWER STAIR STEP NR COURTLAND CA381917121411701618 cfsno long-term record
Recent conditions
| Date | DSCI | D2+ % | Gauges low | Flow pct |
|---|---|---|---|---|
| 2026-09-07 | 46 | 0 | 0/2 | p64 |
Top water assets
- 65Sacramento R A Rio Vista Cariver
- 65Cache C Outflow From Settling Basin Nr Woodland Cariver
- 65Sacramento R Ab Delta Cross Channel Cariver
- 65Threemile Slough Nr Rio Vista Cariver
- 65Green Slough Nr Courtland Cariver
- 65Nemeth Slough Nr Courtland Cariver
- 65Cache Slough Ab Ryer Island Ferry Nr Rio Vista Cariver
- 65Sutter Slough A Courtland Cariver
- 65Yolo Bypass Nr Woodland Cariver
- 65Steamboat Slough Nr Walnut Grove Cariver