Pilarcitos C a Half Moon Bay CA
Is Pilarcitos C a Half Moon Bay CA flooding right now?
Pilarcitos C a Half Moon Bay CA measured 2.63 ft on 2026-09-11 01:00:00 UTC. That observation was 6.5 ft below its 9.1 ft flood stage. This is the latest available reading, not a guarantee of current conditions.
Gauge height
2.63 ft
Streamflow
9 cfs
Minor flooding here begins at 9.1 ft, with major flooding at 24 ft. The highest crest on record was 13.08 ft on Mon, Jan 4, 1982.
Flood stages at this gauge
| Category | Stage | Current distance |
|---|---|---|
| Action | 7.5 ft | 4.9 ft below |
| Minor flood | 9.1 ft | 6.5 ft below |
| Moderate flood | 17 ft | 14.4 ft below |
| Major flood | 24 ft | 21.4 ft below |
Highest crests on record
| Stage | Date |
|---|---|
| 13.08 ft | 1982-01-04 |
| 12.27 ft | 1998-02-03 |
Nearby gauges
| Gauge | Distance | County |
|---|---|---|
| Pilarcitos C below Stone Dam near Hillsborough CA | 4.4 mi | San Mateo County |
| Pilarcitos C above Stone Dam near Hillsborough CA | 4.6 mi | San Mateo County |
| Pilarcitos C below Spillway near Hillsborough CA | 5.6 mi | San Mateo County |
| San Mateo C below Lo Crystal Sp Reservoir near San Mateo CA | 6.0 mi | San Mateo County |
| San Mateo C below Junction Box a Dam1 near Hillsborough | 6.2 mi | San Mateo County |
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Provisional data: Real-time readings are provisional and subject to revision by the USGS — sensors can be affected by ice, debris, or equipment malfunction. Do not rely on this site for decisions involving personal safety; follow official guidance from the National Weather Service and local authorities.