Belmont Creek at Harbor Blvd at Old County Road
California — Water Level & Flood Stage
Located in San Mateo County, California on the Belmont Creek. Live water level data from USGS, updated every 15 minutes.
Current Water Level
Gage Height
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Streamflow
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Last Reading
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This is an NWS forecast point (LID: OCRC1). Live data may be limited. View on NWS AHPS →
Flood Stages
Major Flood
5.2 ft
Moderate Flood
4.5 ft
Minor Flood
4.1 ft
Flood stages defined by the National Weather Service. Gage height data from USGS Water Resources.
What Floods at Each Level
5.2 ft
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 ft
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 ft
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.
Impact statements from the National Weather Service, describing what typically happens at each water level.
7-Day Water Level Chart
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About This Gauge
NWS LID
OCRC1
River
Belmont Creek
County
San Mateo, CA
Coordinates
37.5172°N, 122.2708°W
Get Flood Alerts for Belmont Creek
StormCast monitors this gauge and sends a push notification to your phone when the water level crosses into a new flood category — even at 3 AM.
Frequently Asked Questions
What is the current water level of Belmont Creek at Harbor Blvd at Old County Road?
The Belmont Creek at Harbor Blvd at Old County Road gauge is maintained by USGS and reports water levels every 15 minutes. Visit this page to see the latest reading updated live, or download StormCast to get push alerts when levels rise.
What is flood stage for Belmont Creek at Harbor Blvd at Old County Road?
The NWS-defined flood stage for Belmont Creek at Harbor Blvd at Old County Road is 4.1 feet. Action stage begins at N/A feet. Moderate flooding starts at 4.5 feet, and major flooding at 5.2 feet.
How do I get alerts when Belmont Creek rises?
Download StormCast free on Google Play, go to River Gauges, and add Belmont Creek at Harbor Blvd at Old County Road to your watchlist. StormCast will send a push notification to your phone whenever the water level crosses into a new NWS flood category — even when your screen is off.
Where is the Belmont Creek at Harbor Blvd at Old County Road gauge located?
The gauge is located in San Mateo County, California at coordinates 37.5172°N, 122.2708°W. Data is provided by the U.S. Geological Survey and the National Weather Service.
More Resources
Source & Notes
Data provided by: San Mateo County/City of Belmont