San Gregorio Creek at San Gregorio
Future / Actual / Minor
OWP 2.0 WWA Modal Title
01/11/2021, 10:04 PM UTC through 01/11/2021, 10:04 PM UTC
Sender
Sent
- Upstream gauge unavailableDownstream gauge unavailableWarning: no valid ratings curve available. Transformations to and from FEET/CFS/KCFS will not happen.
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Observed (OBS) 06/28/2025 2:15 PM PDTCATEGORY STAGE 
Major Flooding 25 ft Moderate Flooding 21 ft Minor Flooding 17.7 ft Action 15 ft Reliability of the Forecast:
NOTE: Graphical forecasts are not available during times of high water, forecast crest information can be found in the local WFO web page.
National Water Model Hydrograph
Official NWS streamflow forecasts are produced by NWS hydrologic forecasters for river gauge locations using hydrologic models which are calibrated to that location. This process considers additional guidance and information, including local expertise and experience, to produce the best forecast possible. The NWM output provides supplemental guidance to NWS forecasters and should not be considered an official NWS river forecast.
Flood Impacts
- 25 - Major flood stage. Stage Road at San Gregorio Creek flooded and adjacent floodplain properties under 4 or more feet of water.
- 21 - Moderate flood stage. Adjacent floodplain under several feet of water. Stage Road crossing is backwatered.
- 17.7 - Minor flood stage. Flood waters inundate floodplain upstream of Stage Road crossing, mainly on left bank side (as looking downstream). NWS will issue a Flash Flood Warning if not yet already issued.
Gauge Info
| Coordinates | 37.3258, -122.387 |
| RFC | CNRFC |
| State | CA |
| WFO | MTR |
| County | San Mateo |
| Data Provider(s) | |
| US Geological Survey | USGS--Water Resources of the United States |
| USGS | 11162570 |
Gauge Location
Gauge Photos
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Probability Information
No Images Available
Collaborative Agencies
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.