National Weather Service Advanced Hydrologic Prediction Service

By inergency On Mar 27, 2024

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Pilarcitos Creek at Half Moon Bay

NOTE: Graphical forecasts are not available for the Pilarcitos Creek at Half Moon Bay. During times of high water, forecast crest information can be found in the text products.

Flood Categories (in feet)

Major Flood Stage:	24
Moderate Flood Stage:	17
Flood Stage:	9.1
Action Stage:	7.5
Low Stage (in feet):	-9999

Historic Crests
Currently none available.

Recent Crests
Currently none available.

Low Water Records
Currently none available.

	Gauge Location	Disclaimer
Latitude/Longitude Disclaimer: The gauge location shown in the above map is the approximate location based on the latitude/longitude coordinates provided to the NWS by the gauge owner.

If you notice any errors in the below information, please contact our Webmaster
24	Major flood stage. Major flooding of adjacent neighborhoods. Highway 1 backwatered and flooded at Pilarcitos Creek.
17	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	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	Monitor stage. Water is 1.5 feet below Naomi Patridge Trail.

Latitude: 37.466667° N,
Longitude: 122.434167° W,
Horizontal Datum:
NAD83/WGS84

River Stage Reference Frame	Gauge Height	Flood Stage	Uses
NWS stage	0 ft	9.1 ft	Interpreting hydrographs and NWS watch, warnings, and forecasts, and inundation maps
Vertical Datum	Elevation (gauge height = 0)	Elevation (gauge height = flood stage)	Elevation information source
NAVD88	Not Available	Not Available	Survey grade GPS equipment, FEMA flood plain maps, newer USGS topographic maps
NGVD 29	Not Available	Not Available	Older USGS topographic maps, NGVD29 benchmarks
MSL	Not Available	Not Available	Older USGS topographic maps, MSL benchmarks
Other	Not Available	Not Available

Current/Historical Observations:

The National Weather Service prepares its forecasts and other services in collaboration with agencies like the US Geological Survey, US Bureau of Reclamation, US Army Corps of Engineers, Natural Resource Conservation Service, National Park Service, ALERT Users Group, Bureau of Indian Affairs, and many state and local emergency managers across the country. For details, please click here.

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