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Hydrograph River at a Glance Download
Belmont Creek at Harbor Blvd at Old County Road Stage (ft)Observed: 0.09 ft at 11:40PM Oct 17, 2019Observed: 0.09 ft at 11:39AM Oct 18, 2019Observed: 0.09 ft at 11:37PM Oct 18, 2019Observed: 0.09 ft at 11:36AM Oct 19, 2019Observed: 0.09 ft at 11:34PM Oct 19, 2019Observed: 0.09 ft at 11:33AM Oct 20, 2019Observed: 0.08 ft at 11:31PM Oct 20, 2019Observed: 0.09 ft at 11:30AM Oct 21, 2019Observed: 0.08 ft at 11:28PM Oct 21, 2019Highest Observation: 5.46 ft at 1:57AM Oct 22, 2019Observed: 0.09 ft at 11:27AM Oct 22, 2019OCRC1(plotting HGIRR) Graph Created (9:45PM Oct 22, 2019)ObservedLatest observed value: 0.09 ft at 11:27 AM PDT 22-Oct-2019. Flood Stage is 4.1 ft
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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.
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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 www.floodsmart.gov.

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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.
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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.
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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)
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  
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Page last modified: 1-Mar-2019 12:32 AM
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