RIVER GAUGE · PILARCITOS CREEK
Pilarcitos Creek at Half Moon Bay
San Mateo County, California
Water level2.87 ft
Flow14 cfs
Last readingSep 16, 2026, 4:00 PM UTC (last recorded)
Action7.5 ft
Minor flood9.1 ft
Moderate flood17 ft
Major flood24 ft
The past week
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What floods at each level
- 24 ft
Major flood stage. Major flooding of adjacent neighborhoods. Highway 1 backwatered and flooded at Pilarcitos Creek.
- 17 ft
Moderate flood stage. Homes along Willow/Pilarcitos/Oak Avenue begin to flood. Water is about 3 feet below Highway 1 bridge chord. NWS will issue a Flash Flood Warning if not yet already issued.
- 9.1 ft
Minor flood stage. Water begins to flood Naomi Patridge Trail. NWS will issue an urban/small stream advisory if not yet already issued.
- 7.5 ft
Action Stage. Water is 1.5 feet below Naomi Patridge Trail.
Highest crests on record
| Date | Level | Flow |
|---|---|---|
| Jan 3, 1982 | 13.08 ft | 4,750 cfs |
| Feb 2, 1998 | 12.27 ft | 1,950 cfs |
Get an alert when Pilarcitos Creek rises
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