Tomales-Drake Bays HUC8 18050005
A 1,980 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
77
Healthy
Drought index
0
None
Area in D2+
0%
0% exceptional (D4)
Gauges below normal
0%
of 4 reporting
Median flow
103%
p69 of record
Water assets
67
3 springs · 27 wells
USGS gauges (5)
- LAGUNITAS C NR PT REYES STATION CA114606009 cfsp50 · normal
- WALKER C NR MARSHALL CA114607505 cfsp68 · normal
- LAGUNITAS C A SAMUEL P TAYLOR STATE PARK CA114604009 cfsp71 · normal
- REDWOOD C A HWY 1 BRIDGE A MUIR BEACH CA114601511 cfsp91 · much above normal
- OLEMA C A VEDANTA BRIDGE A OLEMA CA114606050 cfsno long-term record
Recent conditions
| Date | DSCI | D2+ % | Gauges low | Flow pct |
|---|---|---|---|---|
| 2026-10-19 | 0 | 0 | 0/4 | p69 |
| 2026-10-18 | 0 | 0 | 0/4 | p62 |
| 2026-10-17 | 0 | 0 | 0/4 | p63 |
| 2026-10-16 | 0 | 0 | 0/4 | p63 |
| 2026-10-15 | 0 | 0 | 0/4 | p62 |
| 2026-10-14 | 0 | 0 | 0/4 | p69 |
| 2026-10-13 | 0 | 0 | 0/4 | p74 |
| 2026-10-12 | 0 | 0 | 0/4 | p73 |
| 2026-10-11 | 0 | 0 | 0/4 | p68 |
| 2026-10-10 | 0 | 0 | 0/4 | p72 |
| 2026-10-09 | 0 | 0 | 0/4 | p67 |
| 2026-10-08 | 0 | 0 | 0/4 | p68 |
| 2026-10-07 | 0 | 0 | 0/4 | p63 |
| 2026-10-06 | 0 | 0 | 0/4 | p64 |
Top water assets
- 65Redwood C A Hwy 1 Bridge A Muir Beach Cariver
- 65Lagunitas C A Samuel P Taylor State Park Cariver
- 65Olema C A Vedanta Bridge A Olema Cariver
- 65Walker C Nr Marshall Cariver
- 65Lagunitas C Nr Pt Reyes Station Cariver
- 54Les Petersen Drilling & Pump Co Well — Wcr0003286well
- 46Bartley Pump Inc Well — Wcr0002581well
- 46Anderson K Drilling, Inc. Well — Wcr0003217well
- 46Weeks Drilling And Pump Co Well — Wcr0001557well
- 46Tri-K Drilling Well — Wcr0004004well