Skip Navigation Link  
NOAA logo - Click to go to the NOAA homepage National Weather Service NWS logo - Click to go to the NWS homepage
Advanced Hydrologic Prediction Service
Image background of Navigation bar Left
Bookmark and Share Navigation Bar End Cap

Hydrograph River at a Glance Download
Belmont Creek at Harbor Blvd at Old County Road Stage (ft)Highest Observation: 0.09 ft at 7:24AM May 10, 2021Observed: 0.08 ft at 7:23PM May 10, 2021Observed: 0.08 ft at 7:21AM May 11, 2021Observed: 0.08 ft at 7:20PM May 11, 2021Observed: 0.08 ft at 7:18AM May 12, 2021Observed: 0.08 ft at 7:15AM May 13, 2021Observed: 0.08 ft at 7:14PM May 13, 2021Highest Observation: 0.09 ft at 7:12AM May 14, 2021Observed: 0.08 ft at 7:11PM May 14, 2021OCRC1(plotting HGIRR) Graph Created (12:30AM May 15, 2021)ObservedLatest observed value: 0.08 ft at 7:11 PM PDT 14-May-2021. Flood Stage is 4.1 ft
Printable Image
About this graph
Tabular Data (UTC)
Tabular Data (PDT)
XML Data
RSS Files
Datum: Not Available
NOTE: Graphical forecasts are not available for the Belmont Creek at Harbor Blvd at Old County Road. During times of high water, forecast crest information can be found in the text products.
Return to Area Map
Flood Categories (in feet)
Major Flood Stage: 5.2
Moderate Flood Stage: 4.5
Flood Stage: 4.1
Action Stage: 0
Low Stage (in feet): -9999

Historic Crests
Currently none available.

Recent Crests
Currently none available.

Low Water Records
Currently none available.

For more information on your flood risk go to

Zoom Level:16
KML Image
Gauge LocationGauge Map Marker
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.
Flood Impacts & Photos Collapse
If you notice any errors in the below information, please contact our Webmaster
5.2 Major Flooding. CalTrain culvert upstream of Old County Road at full capacity, likely backwatered upstream. Most roadways and businesses in the vicinity of the gauge flooded and impassable. Lower elevation industry and businesses along Old County Road flooded, with the Harbor Blvd/Old County Road intersection under several feet of water. Belmont Creek above channel capacity downstream of Old County Road.
4.5 Moderate Flooding. Storm drain outfall into Belmont Creek on either side of Old County Road completely backwatered, causing street flooding on Old County Road south of Harbor Boulevard. Harbor Boulevard underpass beneath CalTrain rail line also likely flooded. Culvert beneath Old County Road submerged and backwatered. NWS will issue Flash Flood Warning, if not yet already issued.
4.1 Minor Flooding. Water level is approximately 2 feet below lowest storm drain inlet on Old County Road. Storm drains on both side of Old County Road that outfall into Belmont Creek are already backwatered by 2 to 3 feet. NWS will issue an Urban/Small Stream Flood Advisory, if not yet already issued.
About This Location Collapse

Latitude: 37.517222° N, Longitude: 122.270833° W, Horizontal Datum: NAD83/WGS84

River Stage
Reference Frame
Gauge Height Flood Stage Uses
NWS stage 0 ft 4.1 ft Interpreting hydrographs and NWS watch, warnings, and forecasts, and inundation maps
Vertical Datum Elevation
(gauge height = 0)
(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  
Resources Collapse
Hydrologic Resources Additional Resources
Collaborative Agencies Collapse
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.
NWS Information
National Weather Service
San Francisco Bay Area Weather Forecast Office
21 Grace Hopper Ave, Stop 5
Monterey, CA 93943-5505
(831) 656-1725
Ask Questions/Webmaster
Page last modified: 2-Nov-2020 7:27 PM
Privacy Policy
About Us
Career Opportunities