Pilarcitos Creek at Half Moon Bay, CA
River level and flood forecast · San Mateo County
No current reading2.7 ftas of Mon 8 PM
The river is 6.4 ft below flood stage (9.1 ft).
The National Weather Service has no current reading for this gauge, so its flood status isn't known right now.
Flow: 2 cubic feet per second (USGS).
Get flood alerts for this river
An email when the National Weather Service forecasts Pilarcitos Creek at Half Moon Bay to flood, when it floods, and when it's over.
Flood stages
| Major flood stage | 24 ft |
| Moderate flood stage | 17 ft |
| Flood stage | 9.1 ft |
| Action stage | 7.5 ft |
| Record crest (January 4, 1982) | 13.08 ft |
What floods at each level
From the National Weather Service, highest first.
- 24 ftMajor flood stage. Major flooding of adjacent neighborhoods. Highway 1 backwatered and flooded at Pilarcitos Creek.
- 17 ftModerate 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 ftMinor flood stage. Water begins to flood Naomi Patridge Trail. NWS will issue an urban/small stream advisory if not yet already issued.
- 7.5 ftAction Stage. Water is 1.5 feet below Naomi Patridge Trail.
Highest crests on record
- 13.08 ft — January 4, 1982
- 12.27 ft — February 3, 1998
Recent crests: 12.27 ft (February 3, 1998) · 13.08 ft (January 4, 1982)
Up and down the river, and nearby
- Pilarcitos Creek below Stone Dam NR Hillsborough, CA
- Pilarcitos Creek above Stone Dam, CA
- Pilarcitos Creek below Pilarcitos Lake Spillway, CA
- San Mateo Creek below Lower Crystal Springs Reservoir NR San Mateo, CA
- San Mateo Creek below Junction Box, CA
- San Mateo Creek above Junction Box, CA
- San Gregorio Creek at San Gregorio, CA
- San Francisquito Creek at Stanford University, CA
Not an official source. River levels, forecasts, flood stages and impacts are from the National Weather Service (HMNC1); flow from the U.S. Geological Survey. Readings are provisional. In a flood, follow your local officials and the NWS at weather.gov.