CNRFC - Hydrology - River Guidance - Graphical RVF

*** IMPORTANT *** Week of June 16 - Website Data Outage - Due to a major computer upgrade the week of June 16, nearly all data on the CNRFC web site will not be updated. We anticipate the down time to be approximately 4 days. The latest deterministic hydrologic forecasts for official forecast points will continue to be available at the National Water Prediction Service during this time.

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:

Jun 16 2025 at 6:35 AM PDT

Next Issuance:

Jun 17 2025 at 9:00 AM PDT

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 Tonight: Partly cloudy. Breezy. A slight chance of drizzle. Lows in the lower 50s. West winds 20 to 30 mph.

Friday: Partly cloudy in the morning then becoming sunny. Breezy. Highs in the mid to upper 60s. West winds 20 to 30 mph. Gusts up to 50 mph in the afternoon.

Friday Night: Mostly clear. Breezy. Lows in the lower 50s. West winds 20 to 30 mph with gusts to around 45 mph.

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

Saturday Night: Clear, breezy. Lows in the lower 50s. West winds 20 to 30 mph decreasing to 10 to 20 mph after midnight.

Sunday: Sunny. Highs in the 60s to upper 70s.

Sunday Night: Clear in the evening then becoming partly cloudy. Lows in the lower 50s.

Monday through Wednesday: Partly cloudy. Highs in the mid 60s to upper 70s. Lows in the mid 50s.

Wednesday Night: Mostly clear in the evening then becoming partly cloudy. Lows in the mid 50s.

Thursday: Partly cloudy in the morning then becoming sunny. Highs in the 60s to upper 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.

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Verification - Historical Graphical RVF
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To view other verification locations, use our Historical Graphical River Forecast Interface.