Belmont Creek at Harbor Blvd at Old County Road
San Mateo County, California
The past week
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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.
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