National Weather Service California Nevada River Forecast Center Department of Commerce National Oceanic and Atmospheric Administration National Weather Service

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SAN LORENZO CREEK - HAYWARD (LRZC1)
Latitude: 37.69º NLongitude: 122.06º WElevation: 133 Feet
Location: Alameda County in CaliforniaBulletin Group: Central CoastRiver Group: South Bay
Issuance Time: May 02 2025 at 7:42 AM PDTNext Issuance: May 03 2025 at 9:00 AM PDT
Action/Monitor: 20.85 FeetMinor Flood: 24.6 FeetModerate Flood: N/A Major Flood: N/A

Please Note:
1) Each individual timeseries plotted on the graphical river forecast can be toggled on and off by clicking the legend entry above. If the "Observed (Raw Data)" contains bad data and is toggled off, the plot will scale to the remaining timeseries.

2) At extremely low river flows, the "Observed (Raw Data)" may show readings below the lower end of the available rating table, while the "Observed (Simulated)" will only show values at the bottom of the rating table, creating a potential discrepancy between the two readings.
Observed Data Credit
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Raw streamflow data is provided by the US Geological Survey (USGS).
View US Geological Survey (USGS) Data for this station location.

Verification - Historical Graphical RVF
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To view other verification locations, use our Historical Graphical River Forecast Interface.
Location Photographs
ESRI™ Locator Map
Flood Impacts
33.0 FeetMajor Flooding. Homes and local roadways inundated with several feet of water.
29.64 FeetModerate Flooding. Homes and roadways adjacent to the creek in this location begin to flood.
24.64 FeetMinor Flooding. At 24.64 feet, flooding may have begun downstream at the San Lorenzo Creek near San Lorenzo stream gage. NWS will issue Flash Flood Warning if not already issued.
20.85 FeetMonitor stage. At 20.85 feet the San Lorenzo Creek near San Lorenzo gage downstream is close to flooding. NWS will issue a Flash Flood Watch if not already issued.
Official 7 Day National Weather Service Forecast   (CAZ508)
Today: Partly cloudy in the morning then becoming sunny. Highs in the mid 60s. West winds 10 to 20 mph.

Tonight: Mostly cloudy. Lows in the lower 50s. West winds 10 to 20 mph.

Saturday: Cloudy in the morning then becoming partly cloudy. Breezy. Highs in the lower 60s. West winds 10 to 20 mph increasing to 20 to 30 mph in the afternoon.

Saturday Night: Mostly clear. Breezy. Lows in the upper 40s. West winds 20 to 30 mph with gusts to around 45 mph and becoming northwest 10 to 20 mph with gusts to around 35 mph after midnight.

Sunday: Sunny, breezy. Highs in the mid 60s to lower 70s. Northwest winds 10 to 20 mph increasing to west 20 to 30 mph in the afternoon.

Sunday Night: Clear. Lows in the lower 50s.

Monday through Tuesday: Clear. Highs in the 60s to upper 70s. Lows in the lower 50s.

Tuesday Night and Wednesday: Mostly clear. Lows in the lower 50s. Highs in the upper 60s to mid 70s.

Wednesday Night and Thursday: Partly cloudy. Lows in the lower 50s. Highs in the upper 60s to mid 70s.
Product Disclaimer

This river graphic is not intended to serve as a substitute for official flood watches, warnings, advisories, or statements issued by the NWS San Francisco Bay Area-Monterey Weather Forecast Office. Observations are preliminary and subject to change. River levels identified as "forecast" should be consistent with those contained in official NWS products. River levels identified as "guidance" have significant uncertainty due to future weather or reservoir regulation and are provided for planning purposes only.