CNRFC - Hydrology - River Guidance - Graphical RVF

Location:

SAN LORENZO CREEK - HAYWARD (LRZC1)

Latitude: 37.69º N	Longitude: 122.06º W	Elevation: 133 Feet
Location: Alameda County in California		Bulletin Group: Central Coast		River Group: South Bay

Issuance Time:

Dec 25 2025 at 2:02 PM PST

Next Issuance:

Dec 26 2025 at 9:00 AM PST

Action/Monitor: 20.85 Feet

Minor Flood: 24.6 Feet

Moderate Flood: N/A

Major Flood: N/A

Plot Type:

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
	Raw streamflow data is provided by the US Geological Survey (USGS). View US Geological Survey (USGS) Data for this station location.

Location Photographs
Upstream Photo	Gage House Photo	Downstream Photo

ESRI™ Locator Map

Flood Impacts
33.0 Feet	Major Flooding. Homes and local roadways inundated with several feet of water.
29.64 Feet	Moderate Flooding. Homes and roadways adjacent to the creek in this location begin to flood.
24.64 Feet	Minor 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 Feet	Monitor 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)

Rest of Today: Very windy. Showers likely and a slight chance of thunderstorms. Some thunderstorms may be severe with heavy rainfall. Highs in the upper 50s. South winds 30 to 45 mph.

Tonight: Breezy. Showers and a slight chance of thunderstorms in the evening, then a chance of showers after midnight. Some thunderstorms may be severe with heavy rainfall. Lows in the lower 50s. South winds 20 to 30 mph with gusts to around 45 mph decreasing to 10 to 20 mph after midnight.

Friday: Mostly cloudy. A chance of showers. A slight chance of thunderstorms in the afternoon. Some thunderstorms may produce heavy rainfall in the afternoon. Highs in the upper 50s. South winds 10 to 20 mph.

Friday Night: Mostly cloudy. A slight chance of thunderstorms in the evening. A chance of showers. Some thunderstorms may produce heavy rainfall in the evening. Lows in the upper 40s. South winds 5 to 15 mph. Chance of precipitation 50 percent.

Saturday: Mostly cloudy in the morning then becoming partly cloudy. A slight chance of showers. Highs in the mid 50s. North winds 5 to 10 mph. Chance of showers 20 percent.

Saturday Night: Mostly clear in the evening then becoming partly cloudy. Lows in the mid 30s to lower 40s.

Sunday through Tuesday Night: Mostly clear. Highs in the upper 50s. Lows in the 30s to mid 40s.

Wednesday: Partly cloudy in the morning then becoming sunny. Highs in the upper 50s.

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.

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